阅读说明：本技术 一种f类压控振荡电路及其温度补偿方法 (Class F voltage-controlled oscillation circuit and temperature compensation method thereof ) 是由 陈东海 于 2021-08-13 设计创作，主要内容包括：本发明公开一种F类压控振荡电路及其温度补偿方法,涉及集成电路技术领域,用于补偿由于环境温度变化而引起压控振荡子电路产生的频率偏移。F类压控振荡电路,包括压控振荡子电路及补偿电路。补偿电路包括电流生成电路及电压生成电路,电流生成电路的输出端分别与电压生成电路的第一端及压控振荡子电路的目标电容电连接,电压生成电路第二端与接地端电连接。电流生成电路用于向电压生成电路提供与环境温度相关的调节电流。电压生成电路根据调节电流生成调节电压。调节电压用于调整压控振荡子电路中的目标电容的电容量。温度补偿方法应用上述技术方案所提的F类压控振荡电路。(The invention discloses an F-type voltage-controlled oscillation circuit and a temperature compensation method thereof, relates to the technical field of integrated circuits, and is used for compensating frequency offset generated by a voltage-controlled oscillation sub-circuit due to environmental temperature change. The class-F voltage-controlled oscillation circuit comprises a voltage-controlled oscillation sub-circuit and a compensation circuit. The compensation circuit comprises a current generation circuit and a voltage generation circuit, wherein the output end of the current generation circuit is respectively and electrically connected with the first end of the voltage generation circuit and the target capacitor of the voltage-controlled oscillation sub-circuit, and the second end of the voltage generation circuit is electrically connected with the grounding end. The current generating circuit is used for providing a regulating current related to the ambient temperature to the voltage generating circuit. The voltage generation circuit generates a regulated voltage according to the regulated current. The adjustment voltage is used to adjust the capacitance of a target capacitor in the voltage controlled oscillator sub-circuit. The temperature compensation method applies the F-type voltage-controlled oscillating circuit provided by the technical scheme.)

1. A class F voltage-controlled oscillator circuit, comprising: a voltage-controlled oscillation sub-circuit and a compensation circuit;

the compensation circuit includes: the output end of the current generation circuit is respectively and electrically connected with the first end of the voltage generation circuit and the target capacitor of the voltage-controlled oscillation sub-circuit, and the second end of the voltage generation circuit is electrically connected with the grounding end;

the current generation circuit is used for providing a regulating current related to the ambient temperature to the voltage generation circuit; and the voltage generation circuit generates a regulating voltage according to the regulating current, and the regulating voltage is used for adjusting the capacitance of a target capacitor in the voltage control oscillator subcircuit.

2. The class-F voltage-controlled oscillation circuit of claim 1, wherein the voltage generation circuit comprises a first resistor and a first capacitor, the first resistor being an adjustable resistor;

the first end of the first resistor and the first end of the first capacitor are both electrically connected with the output end of the current generation circuit, and the second end of the first resistor and the second end of the first capacitor are both electrically connected with a ground end.

3. The class-F voltage-controlled oscillation circuit of claim 2, wherein the current generation circuit comprises a first current generation sub-circuit and a second current generation sub-circuit electrically connected to each other, and an output terminal of the first current generation sub-circuit and an output terminal of the second current generation sub-circuit are both electrically connected to the first terminal of the first resistor.

4. The class F voltage-controlled oscillation circuit of claim 1, wherein the voltage-controlled oscillation sub-circuit comprises: the first capacitor bank, the second capacitor bank, the third capacitor bank, the fourth capacitor bank and the transformer are in cross coupling; wherein the capacitors in the first capacitor bank and the third capacitor bank are the target capacitors;

the first end of the first capacitor bank and the first end of the second capacitor bank are both electrically connected with the first end of the first switch circuit, the second end of the first capacitor bank and the second end of the second capacitor bank are both electrically connected with the first end of the second switch circuit, and the second end of the first switch circuit and the second end of the second switch circuit are grounded; the first end of the third capacitor bank and the first end of the fourth capacitor bank are both electrically connected with the control end of the first switch circuit, and the second end of the third capacitor bank and the second end of the fourth capacitor bank are both electrically connected with the control end of the second switch circuit; the first capacitor bank and the third capacitor bank are also electrically connected with a first end of the voltage generating circuit, and the second capacitor bank and the fourth capacitor bank are also electrically connected with a first reference power supply end;

the first end of the transformer is electrically connected with the first switch circuit, and the second end of the transformer is electrically connected with the second switch circuit.

5. The class-F voltage-controlled oscillator circuit of claim 4, wherein the transformer comprises a first inductor and a second inductor coupled to each other;

a first end of the first inductor is electrically connected with a first end of the first switch circuit, and a second end of the first inductor is electrically connected with a first end of the second switch circuit; the first end of the second inductor is electrically connected with the control end of the first switch circuit, and the second end of the second inductor is electrically connected with the control end of the second switch circuit.

6. The class-F voltage-controlled oscillation circuit of claim 4, wherein the voltage of the first reference power supply terminal is a fixed voltage.

7. The class F voltage-controlled oscillation circuit according to any one of claims 3 to 6, wherein the first switching circuit comprises a first field effect transistor and the second switching circuit comprises a second field effect transistor.

8. The class F voltage-controlled oscillation circuit of claim 1, further comprising a current control circuit; the current control circuit includes a third switch circuit;

the first end of the third switch circuit is electrically connected with the voltage-controlled oscillation sub-circuit, the second end of the third switch circuit is electrically connected with the grounding end, and the control end of the third switch circuit is electrically connected with the second reference power supply end and is used for controlling the switching state of the voltage-controlled oscillation sub-circuit or keeping the voltage-controlled oscillation sub-circuit in a stable state.

9. A temperature compensation method for a class F voltage-controlled oscillation circuit, wherein the class F voltage-controlled oscillation circuit according to any one of claims 1 to 8 is applied, the temperature compensation method comprising:

the current generation circuit provides a regulated current related to the ambient temperature to the voltage generation circuit;

and the voltage generation circuit generates an adjusting voltage related to the ambient temperature according to the adjusting current and adjusts the capacitance of a target capacitor in the voltage-controlled oscillation sub-circuit according to the adjusting voltage.

Technical Field

The invention relates to the technical field of integrated circuits, in particular to an F-type voltage-controlled oscillating circuit and a temperature compensation method thereof.

Background

The voltage-controlled oscillation circuit refers to an oscillation circuit (VCO for short) in which an output frequency corresponds to an input control voltage, and the output frequency is directly related to the input control voltage. The voltage-controlled oscillating circuit is an important component of the phase-locked loop, and the requirement on the reliability of the phase-locked loop is improved along with the change of the temperature of the working environment of a communication system. Therefore, the demand for voltage-controlled oscillation circuits has also increased.

In the prior art, the change of the environmental temperature can cause the frequency deviation of the output frequency of the voltage-controlled oscillating circuit, and the reliability of the phase-locked loop is reduced.

Disclosure of Invention

The invention aims to provide a class-F voltage-controlled oscillating circuit and a temperature compensation method thereof, which are used for compensating frequency offset generated by a voltage-controlled oscillating sub-circuit due to environmental temperature change.

In order to achieve the above purpose, the invention provides the following technical scheme:

in a first aspect, the present invention provides a class-F voltage-controlled oscillation circuit, which includes a voltage-controlled oscillation sub-circuit and a compensation circuit. The compensation circuit comprises a current generation circuit and a voltage generation circuit, wherein the output end of the current generation circuit is respectively and electrically connected with the first end of the voltage generation circuit and the target capacitor of the voltage-controlled oscillation sub-circuit, and the second end of the voltage generation circuit is electrically connected with the grounding end. The current generating circuit is used for providing a regulating current related to the ambient temperature to the voltage generating circuit. The voltage generation circuit generates a regulated voltage according to the regulated current. The adjustment voltage is used to adjust the capacitance of a target capacitor in the voltage controlled oscillator sub-circuit.

Compared with the prior art, in the class-F voltage-controlled oscillation circuit provided by the invention, the current generation circuit can provide the voltage generation circuit with the adjusting current related to the ambient temperature, and the voltage generation circuit generates the adjusting voltage according to the adjusting current. That is, the regulated voltage is related to the ambient temperature. The voltage generating circuit is electrically connected with a target capacitor in the voltage-controlled oscillating sub-circuit to adjust the capacitance of the target capacitor, so that the frequency offset generated by the voltage-controlled oscillating sub-circuit due to the change of the environmental temperature can be compensated.

In a second aspect, the present invention further provides a temperature compensation method for a class F voltage-controlled oscillation circuit, which applies the class F voltage-controlled oscillation circuit of the first aspect. The temperature compensation method comprises the following steps:

the current generation circuit provides a regulated current related to the ambient temperature to the voltage generation circuit;

the voltage generation circuit generates an adjusting voltage related to the ambient temperature according to the adjusting current, and adjusts the capacitance of a target capacitor in the voltage-controlled oscillation sub-circuit according to the adjusting voltage.

Compared with the prior art, the beneficial effects of the temperature compensation method provided by the invention are the same as those of the class-F voltage-controlled oscillation circuit in the technical scheme, and are not repeated here.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a first circuit structure diagram of a class F voltage-controlled oscillation circuit according to an embodiment of the present invention;

fig. 2 is a circuit structure diagram of a current generation circuit according to an embodiment of the present invention;

FIG. 3 is a graph of regulated voltage versus ambient temperature provided by an embodiment of the present invention;

fig. 4 is a circuit structure diagram of a class F voltage-controlled oscillation circuit according to an embodiment of the present invention;

fig. 5 is a first circuit structure diagram of a current control circuit according to an embodiment of the present invention;

fig. 6 is a circuit structure diagram of a current control circuit according to an embodiment of the present invention.

Reference numerals:

100-a voltage controlled oscillator sub-circuit; 200-a current generating circuit; 300-a voltage generation circuit; 400-a current control circuit; 201-a first current generating sub-circuit; 202-a second current generating sub-circuit.

Detailed Description

In order to facilitate clear description of technical solutions of the embodiments of the present invention, in the embodiments of the present invention, terms such as "first" and "second" are used to distinguish the same items or similar items having substantially the same functions and actions. For example, the first threshold and the second threshold are only used for distinguishing different thresholds, and the sequence order of the thresholds is not limited. Those skilled in the art will appreciate that the terms "first," "second," etc. do not denote any order or quantity, nor do the terms "first," "second," etc. denote any order or importance.

It is to be understood that the terms "exemplary" or "such as" are used herein to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.

In the present invention, "at least one" means one or more, "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone, wherein A and B can be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, a and b combination, a and c combination, b and c combination, or a, b and c combination, wherein a, b and c can be single or multiple.

Fig. 1 illustrates a first circuit configuration diagram of a class F voltage-controlled oscillation circuit according to an embodiment of the present invention. Referring to fig. 1, a class F voltage-controlled oscillation circuit provided in an embodiment of the present invention includes: a voltage controlled oscillator sub-circuit 100 and a compensation circuit. Wherein, the compensating circuit includes: the output terminal of the current generation circuit 200 is electrically connected to the first terminal of the voltage generation circuit 300 and the target capacitor of the voltage-controlled oscillator sub-circuit 100, respectively, and the second terminal of the voltage generation circuit 300 is electrically connected to the ground terminal. The current generation circuit 200 is configured to provide an adjustment current Iall related to the ambient temperature to the voltage generation circuit 300, and the voltage generation circuit 300 generates the adjustment voltage Vtemp according to the adjustment current Iall. The adjustment voltage Vtemp is used to adjust the capacitance of the target capacitor in the voltage-controlled oscillator sub-circuit 100.

Compared with the prior art, in the class-F voltage-controlled oscillation circuit provided by the invention, the current generation circuit 200 can provide the adjustment current Iall related to the ambient temperature to the voltage generation circuit 300, and the voltage generation circuit 300 generates the adjustment voltage Vtemp according to the adjustment current Iall. That is, the adjustment voltage Vtemp is related to the ambient temperature. The voltage generation circuit 300 is electrically connected to the target capacitor in the voltage-controlled oscillation sub-circuit 100 to adjust the capacitance of the target capacitor, so that the frequency offset generated by the voltage-controlled oscillation sub-circuit 100 due to the environmental temperature change can be compensated.

Fig. 2 illustrates a circuit structure diagram of a current generation circuit 200 according to an embodiment of the present invention. In a possible implementation manner, referring to fig. 2, the current generation circuit 200 may include: a first current generating sub-circuit 201 and a second current generating sub-circuit 202 electrically connected. The output terminal of the first current generation sub-circuit 201 and the output terminal of the second current generation sub-circuit 202 are both electrically connected to the voltage generation circuit 300. The first current generation sub-circuit 201 generates a first current Iptat that varies in proportion to the ambient temperature, and the second current generation sub-circuit 202 generates a second current Ibg that is independent of the ambient temperature. The regulation current Iall satisfies:

Iall=Iptat+Ibg。

in one example, referring to fig. 2, the first current generation sub-circuit 201 may include a plurality of field effect transistors Mptat connected in parallel, a first terminal of the field effect transistors Mptat being electrically connected to the power supply terminal, a second terminal of the field effect transistors Mptat being electrically connected to the voltage generation circuit 300, a gate of the field effect transistors Mptat being electrically connected to a ptat cell, the ptat cell providing the voltage Vp to the gate of the field effect transistors Mptat. The ptat cell is a current source whose output current magnitude is proportional to absolute temperature (thermodynamic temperature). The second current generation sub-circuit 202 may also include a plurality of field effect transistors Mbg connected in parallel, a first terminal of the field effect transistors Mbg being electrically connected to the power supply terminal, a second terminal of the field effect transistors Mbg also being electrically connected to the voltage generation circuit 300, a gate of the field effect transistors Mbg being electrically connected to the bg unit, and the bg unit supplying the voltage Vb to the gates of the field effect transistors. The bg unit is a band-gap reference unit, and Ibg represents the current generated by the band-gap reference unit and is independent of temperature. In the actual use process, Iptat and Ibg are both adjustable currents and can be adjusted according to actual conditions. It should be understood that the ptat cell and the bg cell are external circuits, which are not shown in the figures.

In one possible implementation manner, referring to fig. 1, the voltage generation circuit 300 may include a first resistor R1 and a first capacitor C5. The first end of the first resistor R1 and the first end of the first capacitor C5 are both electrically connected to the output terminal of the current generating circuit 200, and the second end of the first resistor R1 and the second end of the first capacitor C5 are electrically connected to the ground terminal.

The voltage generation circuit 300 may satisfy, according to the adjustment voltage Vtemp generated by the adjustment circuit described above:

Vtemp=（Iptat+Ibg)×R1

the first resistor R1 may be an adjustable resistor, and is used to calibrate the adjustment voltage Vtemp according to actual conditions.

FIG. 3 illustrates a graph of regulated voltage versus ambient temperature provided by an embodiment of the present invention. Referring to fig. 3, the ambient temperature is in direct proportion to the regulated voltage.

In a possible implementation manner, referring to fig. 1, the voltage-controlled oscillation sub-circuit 100 may include: the circuit comprises a first switch circuit, a second switch circuit, a first capacitor bank, a second capacitor bank, a third capacitor bank, a fourth capacitor bank and a transformer which are in cross coupling. And the capacitors in the first capacitor group and the third capacitor group are target capacitors.

Referring to fig. 1, the first end of the first capacitor bank and the first end of the second capacitor bank are both electrically connected to the first end of the first switch circuit, and the second end of the first capacitor bank and the second end of the second capacitor bank are both electrically connected to the first end of the second switch circuit. The second end of the first switch circuit and the second end of the second switch circuit are grounded. The first end of the third capacitor bank and the first end of the fourth capacitor bank are both electrically connected with the control end of the first switch circuit, and the second end of the third capacitor bank and the second end of the fourth capacitor bank are both electrically connected with the control end of the second switch circuit. The first capacitor bank and the third capacitor bank are also electrically connected to the first end of the voltage generating circuit 300. The second capacitor set and the fourth capacitor set are also electrically connected with the first reference power supply end. The first end of the transformer is electrically connected with the first switch circuit, and the second end of the transformer is electrically connected with the second switch circuit.

In an actual application process, capacitances of the first capacitor bank, the second capacitor bank, the third capacitor bank and the fourth capacitor bank may be selected according to an actual situation, and the embodiment of the present invention is not particularly limited thereto. The first capacitor bank may include a second capacitor C1a and a third capacitor C1b connected in parallel, the second capacitor bank may include a fourth capacitor C2a and a fifth capacitor C2b connected in parallel, the third capacitor bank may include a sixth capacitor C3a and a seventh capacitor C3b, and the fourth capacitor bank may include an eighth capacitor C4a and a ninth capacitor C4 b. The adjustment voltage Vtemp is used to adjust the capacitances of the second capacitor C1a, the third capacitor C1b, the sixth capacitor C3a, and the seventh capacitor C3 b. The second capacitor C1a, the third capacitor C1b, the fourth capacitor C2a, the fifth capacitor C2b, the sixth capacitor C3a, the seventh capacitor C3b, the eighth capacitor C4a, and the ninth capacitor C4b are all variable capacitors. The voltage of the first reference power terminal is a fixed voltage Vctl.

In one example, referring to fig. 1, the transformer may include a first inductor Lp and a second inductor Ls coupled to each other. The first end of the first inductor Lp is electrically connected with the first end of the first switch circuit, and the second end of the first inductor Lp is electrically connected with the first end of the second switch circuit. A first end of the second inductor Ls is electrically connected to the control end of the first switching circuit, and a second end of the second inductor Ls is electrically connected to the control end of the second switching circuit. The first inductor Lp is also electrically connected to a power supply terminal that provides the first inductor Lp with the voltage VDD. The second inductor Ls is further electrically connected to a third reference supply terminal, which provides a voltage VB to the first inductor Ls.

In a possible implementation manner, referring to fig. 1, the first switching circuit may include a first field effect transistor, and the second switching circuit may include a second field effect transistor.

In one example, referring to fig. 1, the first switch circuit is a first fet M11, and the second switch circuit is a second fet M12. The first fet M11 and the second fet M12 may be both N-type fets or both P-type fets. Fig. 4 illustrates a circuit structure diagram ii of the class F voltage-controlled oscillation circuit according to the embodiment of the present invention. Referring to fig. 1, the first fet M11 and the second fet M12 may be both N-type fets, and referring to fig. 4, the first fet M11 and the second fet M12 may be both P-type fets. At this time, the first inductor Lp is electrically connected to the ground terminal, the second inductor Ls is electrically connected to the third reference power terminal, and the third reference band energy terminal supplies the voltage VB to the first inductor Ls.

In one possible implementation manner, referring to fig. 1, the class F voltage-controlled oscillation circuit may further include a current control circuit 400. The current control circuit 400 is electrically connected to the voltage-controlled oscillation sub-circuit 100, and is used for controlling the switching state of the voltage-controlled oscillation sub-circuit 100 or keeping the voltage-controlled oscillation sub-circuit 100 in a stable state.

In practical use, the current control circuit 400 may include a third switch circuit. A first terminal of the third switching circuit is electrically connected to the voltage-controlled oscillator sub-circuit 100, a second terminal of the third switching circuit is electrically connected to the ground terminal, and a control terminal of the third switching circuit is electrically connected to the second reference power terminal. The second reference power supply terminal supplies a second reference voltage Vbs to the third switch circuit.

Fig. 5 illustrates a first circuit block diagram of the current control circuit 400 according to the embodiment of the present invention. Referring to fig. 5, in an example, the third switching circuit may include a transmission gate TG, a third fet M2, and a fourth fet M3. A first control terminal of the transmission gate TG is used for accessing the first control signal EN, and a second control terminal of the transmission gate TG is used for accessing the second control signal EN _ b. It is understood that the second control signal EN _ b is an inverse signal of the first control signal EN. The first end of the transmission gate TG is electrically connected to the second reference power source terminal, and the second end of the transmission gate TG is electrically connected to the control terminal of the third fet M2 and the first end of the fourth fet M3. The first terminal of the third fet M2 is electrically connected to the second terminal of the first fet, and the second terminal of the third fet M2 is electrically connected to the ground terminal. The control terminal of the fourth fet M3 is used for receiving the second control signal EN _ b, and the second terminal of the fourth fet M3 is electrically connected to the ground terminal. The following description will be made by taking the third fet M2 and the fourth fet M3 as N-type fets for example:

when the first control signal EN is at a high level, the second control signal EN _ b is at a low level. The transmission gate TG is in an on state, the third fet M2 is in an on state, and the fourth fet M3 is in an off state. When the first control signal EN is at a low level, the second control signal EN _ b is at a high level. The transmission gate TG is in an off state, and the fourth fet M3 is in an on state, so that the third fet M2 is in an off state.

Fig. 6 illustrates a circuit configuration diagram of a current control circuit according to an embodiment of the present invention. Referring to fig. 6, in another example, the third switching circuit includes a plurality of fifth fets M4 connected in parallel, a first terminal of each fifth fet M4 is electrically connected to the second terminal of the first fet, a second terminal of each fifth fet M4 is electrically connected to the ground terminal, a control terminal of each fifth fet M4 is electrically connected to the second reference power source terminal, and each fifth fet M4 may be individually switched.

When the current flowing through any one of the fifth field effect transistors M4 is Io, the current I flowing into the voltage-controlled oscillator sub-circuit 100 satisfies:

I=n×Io。

as can be seen from the specific structure of the third switching circuit, the third switching circuit can control the switching state of the voltage-controlled oscillator sub-circuit 100. Or adjust the current flowing through the voltage-controlled oscillator sub-circuit 100 to keep the voltage-controlled oscillator sub-circuit 100 in a stable state.

The embodiment of the invention also provides a temperature compensation method of the F-type voltage-controlled oscillation circuit, and the F-type voltage-controlled oscillation circuit provided by the technical scheme is applied. The temperature compensation method comprises the following steps:

step S100: the current generating circuit 200 provides a regulated current Iall related to the ambient temperature to the voltage generating circuit 300.

Step S200: the voltage generation circuit 300 generates an adjustment voltage Vtemp related to the ambient temperature from the adjustment current Iall, and adjusts the capacitance of the target capacitor in the voltage-controlled oscillation sub-circuit 100 according to the adjustment voltage Vtemp.

Compared with the prior art, the beneficial effects of the temperature compensation method provided by the invention are the same as those of the class-F voltage-controlled oscillation circuit in the technical scheme, and are not repeated here.

While the invention has been described in connection with various embodiments, other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed invention, from a review of the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the word "a" or "an" does not exclude a plurality. A single processor or other unit may fulfill the functions of several items recited in the claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

While the invention has been described in conjunction with specific features and embodiments thereof, it will be evident that various modifications and combinations can be made thereto without departing from the spirit and scope of the invention. Accordingly, the specification and figures are merely exemplary of the invention as defined in the appended claims and are intended to cover any and all modifications, variations, combinations, or equivalents within the scope of the invention. It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.