阅读说明：本技术 实现磁共振谱仪时钟同步的磁共振谱仪系统 (Magnetic resonance spectrometer system for realizing clock synchronization of magnetic resonance spectrometer ) 是由 吴林 张涛 王燕燕 邱胜顺 于 2021-09-08 设计创作，主要内容包括：本发明的实现磁共振谱仪时钟同步的磁共振谱仪系统,所述系统包括：时钟源模块以及与所述时钟源模块连接的一或多个功能模块；其中,所述时钟源模块,用于向各功能模块供给同步时钟信号；每个功能模块,包括：工作时钟同步子模块,用于接收对应该功能模块的同步时钟信号,并基于该同步时钟信号获得一或多路与所述时钟源模块同步且低时钟抖动的工作时钟信号。本发明针对谱仪系统的整体时钟同步提出一揽子的解决方案,将实现谱仪系统各个组成单元之间的时钟同步,解决了谱仪各组成单元获取跟谱仪时钟源单元时钟信号同步且低抖动的时钟需求,从而为谱仪系统服务于磁共振高质量扫描成像奠定坚实的基础。(The invention relates to a magnetic resonance spectrometer system for realizing clock synchronization of a magnetic resonance spectrometer, which comprises: the clock source module and one or more functional modules connected with the clock source module; the clock source module is used for supplying synchronous clock signals to each functional module; each functional module comprising: and the working clock synchronization submodule is used for receiving the synchronous clock signal corresponding to the functional module and acquiring one or more working clock signals which are synchronous with the clock source module and have low clock jitter based on the synchronous clock signal. The invention provides a comprehensive solution for the integral clock synchronization of the spectrometer system, realizes the clock synchronization among all the composition units of the spectrometer system, and solves the clock requirement that all the composition units of the spectrometer acquire clock signals which are synchronous with the clock source unit of the spectrometer and have low jitter, thereby laying a solid foundation for the spectrometer system to serve magnetic resonance high-quality scanning imaging.)

1. A magnetic resonance spectrometer system for achieving clock synchronization of a magnetic resonance spectrometer, the system comprising: the clock source module and one or more functional modules connected with the clock source module;

the clock source module is used for supplying synchronous clock signals to each functional module;

each functional module comprising: and the working clock synchronization submodule is used for receiving the synchronous clock signal corresponding to the functional module and acquiring one or more working clock signals which are synchronous with the clock source module and have low clock jitter based on the synchronous clock signal.

2. The magnetic resonance spectrometer system for implementing clock synchronization of a magnetic resonance spectrometer according to claim 1, wherein the working clock synchronization submodule comprises:

a reference clock acquiring unit, configured to receive a synchronous clock signal corresponding to the functional module, and acquire the reference clock signal corresponding to the functional module based on the synchronous clock;

and the clock recovery and frequency division unit is connected with the reference clock acquisition unit and is used for performing clock recovery and frequency division processing on the reference clock signal to acquire one or more paths of working clock signals which are synchronous with the clock source module and have low clock jitter.

3. The system according to claim 2, wherein the reference clock acquiring unit comprises: a fiber link reference clock unit, comprising:

the optical fiber link receiving subunit is used for receiving a synchronous clock signal in the form of an optical signal which is converted by the clock source module and embedded into the high-speed optical fiber link through the high-speed optical fiber link;

the photoelectric conversion subunit is connected with the optical fiber link receiving subunit and is used for converting the synchronous clock signal in the form of an optical signal into an electric signal;

and the clock recovery subunit is connected with the photoelectric conversion subunit and used for extracting a reference clock signal from the converted electric signal.

4. The magnetic resonance spectrometer system for realizing clock synchronization of the magnetic resonance spectrometer according to claim 2 or 3, wherein the reference clock obtaining unit comprises: a cable reference clock unit comprising:

the cable receiving subunit is used for receiving the synchronous clock signal in the form of the electric signal sent by the clock source module through a coaxial cable;

and the reference clock subunit is connected with the cable receiving subunit and is used for taking the synchronous clock signal as a reference clock signal.

5. The magnetic resonance spectrometer system for achieving clock synchronization of the magnetic resonance spectrometer of claim 2, wherein the clock recovery and frequency division unit comprises:

the clock shaping subunit is used for shaping the reference clock signal to obtain and transmit a standard clock signal; wherein the standard clock signal comprises: standard clock frequency values and level standards;

the voltage controlled oscillator is used for outputting a high-frequency clock signal corresponding to low clock jitter; wherein the high frequency clock signal comprises: a high frequency clock frequency value and a clock signal jitter value;

and the phase-locked loop is connected with the clock shaping subunit and the voltage-controlled oscillator and is used for receiving the standard clock signal and the high-frequency clock signal and outputting one or more working clock signals which are synchronous with the clock source module and are jittered at a low hour clock.

6. The system according to claim 5, wherein the phase-locked loop is configured to perform frequency multiplication and/or frequency division on the standard clock signal according to the received standard clock signal and the high-frequency clock signal, and output a working clock signal that is synchronous with the clock source module and has low clock jitter;

wherein the operating clock signal comprises: a working clock frequency and a working clock jitter value; and wherein the operating clock frequency is related to a standard clock frequency value of the standard clock signal; the operating clock jitter value is related to a clock signal jitter value of the high frequency clock signal.

7. The system according to claim 1 or 3, wherein the clock source module comprises: and the electro-optical conversion module is used for obtaining a synchronous clock signal in the form of an electrical signal converted into a synchronous clock signal in the form of an optical signal.

8. The system of claim 1, wherein the functional modules are of the type comprising: the system comprises one or more of a PCI card, a radio frequency transmitting module, a radio frequency receiving module, a gradient transmitting module and a radio frequency energy monitoring module.

9. The system of claim 1, wherein the clock source module comprises: and (5) carrying out constant temperature crystal oscillation.

10. The system according to claim 1, wherein the clock source module is connected to the functional modules via high-speed fiber links and/or coaxial cables.

Technical Field

The invention relates to the technical field of electronic information, in particular to a magnetic resonance spectrometer system for realizing clock synchronization of the magnetic resonance spectrometer.

Background

The performance of the magnetic resonance spectrometer system, which is taken as a key core platform of magnetic resonance, has a crucial influence on the quality, particularly the spatial resolution, of a magnetic resonance scanning image and the stable operation of the whole machine. The clock synchronization among all the components of the magnetic resonance spectrometer system is one of the basic functions of the magnetic resonance spectrometer system.

However, in the prior art, some methods for realizing clock synchronization of a magnetic resonance spectrometer system only propose corresponding solutions from the perspective of realizing clock synchronization between local units of the magnetic resonance spectrometer system, do not propose a comprehensive solution for the overall clock synchronization of the magnetic resonance spectrometer system, and also only propose a solution for synchronizing and unifying the working clocks of the constituent units of the spectrometer with the clock of the clock source system, but do not solve the problem of system synchronization clock transmission of the magnetic resonance spectrometer and the problem of high-quality synchronous clock generation of the constituent units of the spectrometer, and thus cannot meet the requirement that the constituent units of the spectrometer acquire clocks which are synchronous with the clock signal of the clock source unit and have low jitter, and further cause low quality magnetic resonance scanning images.

Disclosure of Invention

In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a magnetic resonance spectrometer system for realizing clock synchronization of a magnetic resonance spectrometer, which is used to solve the problems that in the prior art, no comprehensive solution is provided for the overall clock synchronization of the magnetic resonance spectrometer system, and the clock requirements of each component unit of a spectrometer for acquiring a clock signal which is synchronous with a clock source unit of the spectrometer and has low jitter cannot be satisfied.

To achieve the above and other related objects, the present invention provides a magnetic resonance spectrometer system for achieving clock synchronization of a magnetic resonance spectrometer, the system comprising: the clock source module and one or more functional modules connected with the clock source module; the clock source module is used for supplying synchronous clock signals to each functional module; each functional module comprising: and the working clock synchronization submodule is used for receiving the synchronous clock signal corresponding to the functional module and acquiring one or more working clock signals which are synchronous with the clock source module and have low clock jitter based on the synchronous clock signal.

In an embodiment of the present invention, the working clock synchronization sub-module includes: a reference clock acquiring unit, configured to receive a synchronous clock signal corresponding to the functional module, and acquire the reference clock signal corresponding to the functional module based on the synchronous clock; and the clock recovery and frequency division unit is connected with the reference clock acquisition unit and is used for performing clock recovery and frequency division processing on the reference clock signal to acquire one or more paths of working clock signals which are synchronous with the clock source module and have low clock jitter.

In an embodiment of the present invention, the reference clock obtaining unit includes: a fiber link reference clock unit, comprising: the optical fiber link receiving subunit is used for receiving a synchronous clock signal in the form of an optical signal which is converted by the clock source module and embedded into the high-speed optical fiber link through the high-speed optical fiber link; the photoelectric conversion subunit is connected with the optical fiber link receiving subunit and is used for converting the synchronous clock signal in the form of an optical signal into an electric signal; and the clock recovery subunit is connected with the photoelectric conversion subunit and used for extracting a reference clock signal from the converted electric signal.

In an embodiment of the present invention, the reference clock obtaining unit includes: a cable reference clock unit comprising: the cable receiving subunit is used for receiving the synchronous clock signal in the form of the electric signal sent by the clock source module through a coaxial cable; and the reference clock subunit is connected with the cable receiving subunit and is used for taking the synchronous clock signal as a reference clock signal.

In an embodiment of the present invention, the clock recovery and frequency division unit includes: the clock shaping subunit is used for shaping the reference clock signal to obtain and transmit a standard clock signal; wherein the standard clock signal comprises: standard clock frequency values and level standards; the voltage controlled oscillator is used for outputting a high-frequency clock signal corresponding to low clock jitter; wherein the high frequency clock signal comprises: a high frequency clock frequency value and a clock signal jitter value; and the phase-locked loop is connected with the clock shaping subunit and the voltage-controlled oscillator and is used for receiving the standard clock signal and the high-frequency clock signal and outputting one or more working clock signals which are synchronous with the clock source module and are jittered at a low hour clock.

In an embodiment of the present invention, the phase-locked loop is configured to perform frequency multiplication and/or frequency division processing on a standard clock signal according to the received standard clock signal and a high-frequency clock signal, and output a working clock signal that is synchronous with the clock source module and is jittered at a low hour; wherein the operating clock signal comprises: a working clock frequency and a working clock jitter value; and wherein the operating clock frequency is related to a standard clock frequency value of the standard clock signal; the operating clock jitter value is related to a clock signal jitter value of the high frequency clock signal.

In an embodiment of the present invention, the clock source module includes: and the electro-optical conversion module is used for obtaining a synchronous clock signal in the form of an electrical signal converted into a synchronous clock signal in the form of an optical signal.

In an embodiment of the present invention, the types of the functional modules include: the system comprises one or more of a PCI card, a radio frequency transmitting module, a radio frequency receiving module, a gradient transmitting module and a radio frequency energy monitoring module.

In an embodiment of the present invention, the clock source module includes: and (5) carrying out constant temperature crystal oscillation.

In an embodiment of the present invention, the clock source module is connected to each functional module through a high-speed optical fiber link and/or a coaxial cable.

As described above, the present invention is a magnetic resonance spectrometer system for realizing clock synchronization of a magnetic resonance spectrometer, and has the following advantages: the invention provides a comprehensive solution for the integral clock synchronization of the spectrometer system, realizes the clock synchronization among all the composition units of the spectrometer system, and solves the clock requirement that all the composition units of the spectrometer acquire clock signals which are synchronous with the clock source unit of the spectrometer and have low jitter, thereby laying a solid foundation for the spectrometer system to serve magnetic resonance high-quality scanning imaging.

Drawings

Fig. 1 is a schematic structural diagram of a magnetic resonance spectrometer system for implementing clock synchronization of a magnetic resonance spectrometer according to an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a magnetic resonance spectrometer system for implementing clock synchronization of a magnetic resonance spectrometer according to an embodiment of the present invention.

Fig. 3 is a schematic structural diagram of an operating clock synchronization submodule according to an embodiment of the present invention.

Fig. 4 is a schematic structural diagram of an operating clock synchronization submodule according to an embodiment of the present invention.

Fig. 5 is a schematic structural diagram of an operating clock synchronization submodule according to an embodiment of the present invention.

Fig. 6 is a schematic structural diagram of a clock recovery and frequency division unit according to an embodiment of the present invention.

Fig. 7 is a schematic structural diagram of a clock recovery and frequency division unit according to an embodiment of the invention.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.

It is noted that in the following description, reference is made to the accompanying drawings which illustrate several embodiments of the present invention. It is to be understood that other embodiments may be utilized and that mechanical, structural, electrical, and operational changes may be made without departing from the spirit and scope of the present invention. The following detailed description is not to be taken in a limiting sense, and the scope of embodiments of the present invention is defined only by the claims of the issued patent. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Spatially relative terms, such as "upper," "lower," "left," "right," "lower," "below," "lower," "over," "upper," and the like, may be used herein to facilitate describing one element or feature's relationship to another element or feature as illustrated in the figures.

Throughout the specification, when a part is referred to as being "connected" to another part, this includes not only a case of being "directly connected" but also a case of being "indirectly connected" with another element interposed therebetween. In addition, when a certain part is referred to as "including" a certain component, unless otherwise stated, other components are not excluded, but it means that other components may be included.

The terms first, second, third, etc. are used herein to describe various elements, components, regions, layers and/or sections, but are not limited thereto. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the scope of the present invention.

Also, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context indicates otherwise. It will be further understood that the terms "comprises," "comprising," and/or "comprising," when used in this specification, specify the presence of stated features, operations, elements, components, items, species, and/or groups, but do not preclude the presence, or addition of one or more other features, operations, elements, components, items, species, and/or groups thereof. The terms "or" and/or "as used herein are to be construed as inclusive or meaning any one or any combination. Thus, "A, B or C" or "A, B and/or C" means "any of the following: a; b; c; a and B; a and C; b and C; A. b and C ". An exception to this definition will occur only when a combination of elements, functions or operations are inherently mutually exclusive in some way.

The invention provides a magnetic resonance spectrometer system for realizing clock synchronization of a magnetic resonance spectrometer, and provides a comprehensive solution for the whole clock synchronization of the spectrometer system, so that the clock synchronization among all the constituent units of the spectrometer system is realized, the clock requirements of the constituent units of the spectrometer for acquiring clock signals which are synchronous with clock signals of a clock source unit of the spectrometer and have low jitter are met, and a solid foundation is laid for the spectrometer system to serve for magnetic resonance high-quality scanning imaging.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that those skilled in the art can easily implement the embodiments of the present invention. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

Fig. 1 shows a schematic structural diagram of a magnetic resonance spectrometer system for implementing clock synchronization of a magnetic resonance spectrometer according to an embodiment of the present invention.

The system comprises: a clock source module 11 and one or more functional modules 12 connected to the clock source module 11; the clock source module 11 is configured to supply a synchronous clock signal to each functional module; each functional module 12 comprises: the working clock synchronization submodule 121 is configured to receive a synchronization clock signal corresponding to the functional module 12, and obtain one or more working clock signals that are synchronous with the clock source module 11 and have low clock jitter based on the synchronization clock signal.

The number of the functional modules 12 is set according to requirements, and only 4 are taken as an example in the first drawing, which is not limited in the present application. The functions realized by the functional modules are determined according to specific requirements, and are not limited in the application.

Optionally, the clock source module 11 includes: a constant temperature crystal oscillator; i.e. the clock unit on board the clock source module 11 is usually realized by a thermostatic crystal oscillator, the temperature drift coefficient of which is usually ppb magnitude and the frequency is 10MHz or 100MHz, so as to realize that the clock source of the spectrometer has a very low temperature drift coefficient.

Optionally, the types of the functional module 12 include: the system comprises one or more of a PCI card, a radio frequency transmitting module, a radio frequency receiving module, a gradient transmitting module and a radio frequency energy monitoring module.

For example, as shown in FIG. 2, a magnetic resonance spectrometer system includes: the clock source module, and a PCI card, a radio frequency transmitting module, a radio frequency receiving module, a gradient transmitting module and a radio frequency energy monitoring module connected to the clock source module 11.

It should be noted that the functional modules are not limited to the types mentioned above, and may also include common functional module types of a magnetic resonance spectrometer, such as an inter-device management module, an inter-magnet management module, and a radio frequency channel selection module.

Optionally, there are 2 ways for the clock source module 11 to supply the synchronous clock signal to each functional module 12: 1) the coaxial cable electrically transmits a clock signal; 2) transmitted optically over a high-speed fiber link. The clock source module 11 is connected to each functional module 12 through a high-speed optical fiber link and/or a coaxial cable.

Specifically, when the clock source module 11 is connected to each functional module 12 through a high-speed optical fiber link, the clock source module 11 may supply a synchronous clock signal to each functional module 12 through the high-speed optical fiber link, that is, a synchronous clock signal in the form of an optical signal embedded into the high-speed optical fiber link; when the clock source module 11 is connected to each functional module 12 through a coaxial cable, the clock source module 11 may sequentially supply a synchronous clock signal in the form of an electrical signal to each functional module 12 through the coaxial cable; when the clock source module 11 is connected to each functional module 12 through two ways, i.e. a high-speed optical fiber link and a coaxial cable, the clock source module not only provides the synchronous clock signals in the form of optical signals embedded in the high-speed optical fiber link, but also sequentially provides the synchronous clock signals in the form of electrical signals to each functional module 12 through the coaxial cable.

Preferably, which kind of connection mode of the clock source module 11 and each functional module 12 is specifically selected when the actual spectrometer is implemented can be decided according to the requirement of the actual spectrometer system architecture, for example, when a light speed optical fiber link is required to perform spectrometer service data communication between each functional module 12 of the spectrometer system, the synchronous clock sent to each functional module 12 by the clock source module 11 can be embedded into the high speed optical fiber link and transmitted together with the spectrometer service data signal, and this kind of situation does not need a separate coaxial cable to be used for the synchronous clock in the form that the clock source module 11 transmits the electric signal to each functional module 12 of the spectrometer system. However, if the spectrometer service data is not transmitted between the functional modules 12 of the spectrometer system through the high-speed optical fiber link, but is transmitted through the TCP/IP protocol (or other protocol) in the form of a cable, a separate coaxial cable is required for the clock source module 11 to transmit the synchronous clock in the form of an electrical signal to the functional modules 12 of the spectrometer system.

Optionally, when the clock source module 11 is connected to each functional module 12 through a high-speed optical fiber link, the clock source module 11 needs to supply a synchronous clock signal in an optical signal form to each functional module 12 through the high-speed optical fiber link, and therefore the clock source module 11 includes: and the electro-optical conversion module is used for obtaining a synchronous clock signal in the form of an electrical signal converted into a synchronous clock signal in the form of an optical signal.

Optionally, the working clock synchronization sub-module 121 includes: a reference clock acquiring unit, configured to receive a synchronous clock signal corresponding to the functional module, and acquire the reference clock signal corresponding to the functional module based on the synchronous clock; and the clock recovery and frequency division unit is connected with the reference clock acquisition unit and is used for performing clock recovery and frequency division processing on the reference clock signal to acquire one or more paths of working clock signals which are synchronous with the clock source module and have low clock jitter.

Aiming at the difference of the connection modes of the clock source module and each functional module, the following embodiments are provided for explaining the working principle and the structure of the working principle of the working clock synchronization submodule in the functional module under different connection modes; it should be noted that the working clock synchronization submodule herein can implement the functions of the working clock synchronization submodule 121 in fig. 1.

As shown in fig. 3, a structure diagram of a working clock synchronization sub-module in an embodiment of the present invention is shown, where when the clock source module is connected to each functional module only through a high-speed optical fiber link, the working clock synchronization sub-module includes: a fiber link reference clock unit 31 and a clock recovery and frequency division unit 32; wherein the optical fiber link reference clock unit 31 includes: an optical fiber link receiving subunit 311, configured to receive, through a high-speed optical fiber link, a synchronous clock signal in the form of an optical signal converted by the clock source module and embedded into the high-speed optical fiber link; an optical-to-electrical conversion subunit 312, connected to the optical fiber link receiving subunit 311, and configured to convert the synchronous clock signal in the form of an optical signal into an electrical signal; a clock recovery subunit 313, connected to the photoelectric conversion subunit 312, for extracting a reference clock signal from the converted electrical signal. The clock recovery and frequency division unit 32 is connected to the optical fiber link reference clock unit 31, and is configured to perform clock recovery and frequency division processing on the reference clock signal, so as to obtain one or more working clock signals that are synchronous with the clock source module and have low clock jitter.

As shown in fig. 4, a structure diagram of a working clock synchronization submodule in an embodiment of the present invention is shown, where when the clock source module is connected to each functional module only through a coaxial cable, the working clock synchronization submodule includes: a cable reference clock unit 41 and a clock recovery and frequency division unit 42; wherein the cable reference clock unit comprises: the cable receiving subunit is used for receiving the synchronous clock signal in the form of the electric signal sent by the clock source module through a coaxial cable; and the reference clock subunit is connected with the cable receiving subunit and is used for taking the synchronous clock signal as a reference clock signal. The clock recovery and frequency division unit 42 is connected to the cable reference clock unit 41, and is configured to perform clock recovery and frequency division processing on the reference clock signal, so as to obtain one or more working clock signals that are synchronous with the clock source module and have low clock jitter.

As shown in fig. 5, a structure diagram of a working clock synchronization sub-module in an embodiment of the present invention is shown, where when the clock source module is connected to each functional module through two ways, namely, a high-speed optical fiber link and a coaxial cable, the working clock synchronization sub-module includes: a fiber link reference clock unit 51, a cable reference clock unit 52 and a clock recovery and frequency division unit 53; wherein the optical fiber link reference clock unit 51 includes: an optical fiber link receiving subunit 511, a photoelectric conversion subunit 512, and a clock recovery subunit 513; the cable reference clock unit 52 includes: a cable receiving subunit and a reference clock subunit;

it should be noted that the optical fiber link reference clock unit 51, the cable reference clock unit 52, and the clock recovery and frequency division unit 53 may implement the functions of the optical fiber link reference clock unit, the cable reference clock unit, and the clock recovery and frequency division unit in fig. 3 and fig. 4, which are not described herein again.

To facilitate understanding by those skilled in the art, the clock recovery and divide unit will now be further described with reference to fig. 6.

FIG. 6 is a block diagram of a clock recovery and frequency division unit according to an embodiment of the present invention; the clock recovery and divide unit includes: a clock shaping subunit 61, configured to shape the reference clock signal, and obtain and transmit a standard clock signal; wherein the standard clock signal comprises: standard clock frequency values and level standards; a voltage controlled oscillator 62 for outputting a high frequency clock signal corresponding to low clock jitter; wherein the high frequency clock signal comprises: a high frequency clock frequency value and a clock signal jitter value; and the phase-locked loop 63 is connected with the clock shaping subunit 61 and the voltage-controlled oscillator 62, and is configured to receive the standard clock signal and the high-frequency clock signal, and output one or more working clock signals that are synchronous with the clock source module and jitter at a low hour clock.

The number of the operating clock signals, the frequency and the level standard in this embodiment are determined according to the actual requirements of the corresponding functional module, and are not limited herein. For example, a radio frequency receiving module generally needs a phase-locked loop to output 3 paths of clock signals, the 1 st path is a clock signal supplied to a field programmable gate array FPGA, the frequency of the signal is 100MHz, and the level standard is LVPECL; the 2 nd path of clock signal is a conversion clock provided for an analog-to-digital conversion chip ADC, the frequency is 80MHz, and the level standard is LVPECL; the 3 rd path clock signal is a synchronous clock provided for the switching power supply chip, the clock frequency is 1MHz, and the level standard is CMOS.

In one implementation manner in this embodiment, the phase-locked loop is configured to perform frequency multiplication and/or frequency division processing on a standard clock signal according to the received standard clock signal and a high-frequency clock signal, and output a working clock signal that is synchronous with the clock source module and is low in clock jitter; wherein the operating clock signal comprises: a working clock frequency and a working clock jitter value; and wherein the operating clock frequency is related to a standard clock frequency value of a standard clock signal; the operating clock jitter value is related to a clock signal jitter value of the high frequency clock signal.

Preferably, the working clock frequency is obtained by taking a standard clock frequency value of a standard clock signal as a reference, namely, the working clock frequency is an integral multiple of the standard clock frequency value; the operating clock jitter value is substantially identical to a clock signal jitter value of the high frequency clock signal.

In order to better describe the magnetic resonance spectrometer system for realizing the clock synchronization of the magnetic resonance spectrometer, a specific embodiment is provided;

example 1: a clock recovery and frequency division unit applied to a radio frequency receiving module. Fig. 7 is a schematic diagram of the structure of the clock recovery and frequency division unit of the present embodiment;

the clock recovery and frequency division unit consists of the following functional components: a clock shaping subunit, a phase locked loop and a voltage controlled oscillator. The clock shaping subunit receives a reference clock signal from the clock source unit, shapes the reference clock signal into a standard clock signal with a duty ratio of 1:1, and the level standard is CMOS; the voltage-controlled oscillator provides a high-frequency clock with ultra-low clock jitter to the phase-locked loop, the output clock jitter of the voltage-controlled oscillator is usually between 200fs and 1000fs, and the frequency is between 3GHz and 4 GHz. The input of the phase-locked loop mainly comprises a shaped clock signal and a clock signal output by a voltage-controlled oscillator, the phase-locked loop outputs 3 paths of clock signals, the 1 st path is a clock signal supplied to a Field Programmable Gate Array (FPGA), the frequency of the signal is 100MHz, and the level standard is LVPECL; the 2 nd path of clock signal is a conversion clock provided for an analog-to-digital conversion chip ADC, the frequency is 80MHz, and the level standard is LVPECL; the 3 rd path clock signal is a synchronous clock provided for the switching power supply chip, the clock frequency is 1MHz, and the level standard is CMOS.

When the frequency of the reference clock signal received by the clock shaping subunit is 10MHz, the clock frequency output to the phase-locked loop by the clock shaping subunit is 10MHz, and assuming that the clock frequency of the voltage-controlled oscillator is 3.6GHz, the relationship between the ADC conversion clock signal of the analog-to-digital conversion chip with the frequency of 80MHz of the radio frequency receiving unit and the reference clock and the clock frequency of the voltage-controlled oscillator is: the ADC converts the clock frequency 80MHz to 10 × 360/45, i.e., first multiplies the frequency of the reference clock signal by 3.6GHz (10 × 360MHz), and then divides the frequency of the 3.6GHz clock by 45 to 80 MHz. The 1 st path clock signal and the 3 rd path clock signal of the radio frequency receiving unit are also obtained according to the above principle. The frequency of the output clock signal of the phase-locked loop takes the frequency of the shaped reference clock signal as a reference frequency, and since the reference clock frequency 10MHz mentioned in this patent is not 10MHz of the exact frequency in a strict sense, for example, 9.998MHz in practical application, the ADC conversion clock frequency 9.998 × 360/45 is 79.984 MHz; the jitter of the clock signal output by the vco determines the output clock jitter of the pll, for example, if the jitter of the clock signal output by the vco is 300fs, the output clock jitter of the pll is also about 300 fs.

Example 2: a magnetic resonance spectrometer system for realizing clock synchronization of a magnetic resonance spectrometer.

The system comprises: the clock source module and the radio frequency link are formed by the radio frequency transmitting module and the radio frequency receiving module; the clock source module is used for respectively supplying synchronous clock signals to the radio frequency transmitting module and the radio frequency receiving module; the radio frequency transmitting module and the radio frequency receiving module both comprise: and the working clock synchronization submodule is used for receiving the synchronous clock signal and acquiring one or more working clock signals which are synchronous with the clock source module and have low clock jitter based on the synchronous clock signal.

The frequency of the synchronous clock signal is 10MHz, the DAC conversion clock of the digital-to-analog conversion chip output by the radio frequency transmitting unit is 640MHz, the ADC conversion clock of the analog-to-digital conversion chip output by the radio frequency receiving unit is 80MHz, the DAC of the radio frequency transmitting unit and the ADC conversion clock of the radio frequency receiving unit are in integral multiple relation and are also in integral multiple with the frequency of the synchronous clock signal, namely 10 MHz. The clocks of the rf transmitting unit and the rf receiving unit are therefore considered to be synchronized so that the phases of the rf links are coherent. In general, if the test is continued for 15 minutes with a received signal phase fluctuation of ≦ 1, the phase of the radio frequency link may be considered coherent. Phase coherence is a very key design index in the field of magnetic resonance, and only if the phase coherence is achieved in the radio frequency link of the magnetic resonance spectrometer system, the radio frequency link of the magnetic resonance spectrometer system can be ensured not to generate artifacts during magnetic resonance image scanning.

In summary, the invention provides a comprehensive solution for the overall clock synchronization of the spectrometer system, so as to realize the clock synchronization among the constituent units of the spectrometer system, and solve the clock requirement that the constituent units of the spectrometer acquire clock signals synchronous with the clock source unit of the spectrometer and have low jitter, thereby laying a solid foundation for the spectrometer system to serve for magnetic resonance high-quality scanning imaging. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.

The foregoing embodiments are merely illustrative of the principles of the present invention and its efficacy, and are not to be construed as limiting the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.