阅读说明：本技术 一种提高石英晶体振荡器频率稳定度的方法 (method for improving frequency stability of quartz crystal oscillator ) 是由 贾英茜 王建永 李玉健 于 2019-09-10 设计创作，主要内容包括：本发明公开了一种提高石英晶体振荡器频率稳定度的方法,涉及微波射频电路技术领域,包括以下步骤：A：电源输入：将电源输入至稳压电路,稳压电路输出稳定的电压；B：提供稳定电压：将稳压电路输出的稳定电压提供给10MHz振荡电路、10MHz10倍频放大电路、100MHz振荡电路、100MHz放大电路、控温电路等各部分；C：信号放大：10MHz振荡电路产生10MHz振荡信号,10MHz振荡信号经10MHz10倍频放大电路后注入到100MHz振荡电路；D：信号输出：100MHz振荡电路输出100MHz振荡信号,经100MHz放大电路和100MHz滤波电路后输出。本发明通过注入锁定方式,将高频率稳定度的10MHz石英晶体振荡器的10倍频信号注入到100MHz石英晶体振荡器,提高100MHz石英晶体振荡器的频率稳定度。(The invention discloses a method for improving the frequency stability of a quartz crystal oscillator, which relates to the technical field of microwave radio frequency circuits and comprises the following steps: a: power supply input: inputting a power supply to a voltage stabilizing circuit, wherein the voltage stabilizing circuit outputs a stable voltage; b: providing a stable voltage: the stable voltage output by the voltage stabilizing circuit is provided for a 10MHz oscillating circuit, a 10MHz10 frequency multiplication amplifying circuit, a 100MHz oscillating circuit, a 100MHz amplifying circuit, a temperature control circuit and the like; c: signal amplification: the 10MHz oscillation circuit generates a 10MHz oscillation signal, and the 10MHz oscillation signal is injected into the 100MHz oscillation circuit after passing through the 10MHz10 frequency multiplication amplifying circuit; d: and (3) signal output: the 100MHz oscillating circuit outputs 100MHz oscillating signal, which is output through 100MHz amplifying circuit and 100MHz filter circuit. According to the invention, 10 frequency multiplication signals of the 10MHz quartz crystal oscillator with high frequency stability are injected into the 100MHz quartz crystal oscillator in an injection locking mode, so that the frequency stability of the 100MHz quartz crystal oscillator is improved.)

1. a method for improving the frequency stability of a quartz crystal oscillator is characterized by comprising the following steps:

A: power supply input: inputting a power supply to a voltage stabilizing circuit, wherein the voltage stabilizing circuit outputs a stable voltage;

B: providing a stable voltage: the stable voltage output by the voltage stabilizing circuit is provided for a 10MHz oscillating circuit, a 10MHz10 frequency multiplication amplifying circuit, a 100MHz oscillating circuit, a 100MHz amplifying circuit, a temperature control circuit and the like;

c: signal amplification: the 10MHz oscillation circuit generates a 10MHz oscillation signal, and the 10MHz oscillation signal is injected into the 100MHz oscillation circuit after passing through the 10MHz10 frequency multiplication amplifying circuit;

d: and (3) signal output: the 100MHz oscillating circuit outputs 100MHz oscillating signal, which is output through 100MHz amplifying circuit and 100MHz filter circuit.

2. a method of improving frequency stability of a quartz crystal oscillator according to claim 1, wherein:

And C, performing 10 frequency multiplication on the 10MHz signal generated by the 10MHz oscillating circuit in the step C to obtain a 100MHz signal, injecting the 100MHz signal into a main oscillation triode of the 100MHz oscillating circuit, and locking the 10MHz frequency multiplication signal to the 100MHz oscillating circuit.

3. a method of improving frequency stability of a quartz crystal oscillator according to claim 1, wherein:

In the step C, a 10MHz oscillation signal is output by a 10MHz quartz crystal oscillator (1);

And D, outputting the 100MHz oscillation signal in the step D by a 100MHz quartz crystal oscillator (2).

4. A method of improving frequency stability of a quartz crystal oscillator according to claim 3, wherein:

The 10MHz quartz crystal oscillator (1) and the 100MHz quartz crystal oscillator (2) are connected on the oscillation and temperature control circuit board (3), and the oscillation and temperature control circuit board (3) is fixedly arranged on a crystal oscillator tube seat.

Technical Field

the invention relates to the technical field of microwave radio frequency circuits, in particular to a method for improving the frequency stability of a quartz crystal oscillator.

background

At present, in an instrument, a communication system, a vehicle-mounted, airborne, missile-borne and other aerospace military electronic systems, a 100MHz quartz crystal oscillator with high frequency stability and low phase noise is often used as a reference signal source of the system. Oscillators using 100MHz quartz crystal oscillators can typically have low phase noise, but frequency stability is difficult to achieve in some applications. In order to improve the frequency stability of a 100MHz quartz crystal oscillator, two methods are generally used. One method is to use a 10MHz quartz crystal oscillator with higher frequency stability as a fundamental frequency signal, obtain a 100MHz signal by a 10 frequency doubling method, but the phase noise of the output signal will be worsened; another method is to use digital phase locking. The 10MHz quartz crystal oscillator with high frequency stability is used as a reference signal, and the frequency stability of the 100MHz signal is consistent with that of the 10MHz quartz crystal oscillator in a digital phase locking mode. But the phase noise is also degraded by the digital signal introduced by the use of the digital phase locked loop, the noise of the digital phase locked loop device itself. The 10MHz crystal oscillator has a lower frequency relative to the 100MHz crystal oscillator, so the 10MHz crystal oscillator can generally achieve a higher frequency stability. By extracting 10 frequency multiplication of an output signal of the 10MHz quartz crystal oscillator and injecting the output signal into an oscillating circuit of the 100MHz quartz crystal oscillator, the 100MHz quartz crystal oscillator can have the same frequency stability as the 10MHz quartz crystal oscillator without influencing the phase noise of the 100MHz quartz crystal oscillator, and the near-end phase noise of the 100MHz quartz crystal oscillator can be optimized, so that the 100MHz quartz crystal oscillator with low phase noise and high frequency stability is realized.

disclosure of Invention

technical problem to be solved

Aiming at the defect of low frequency stability of the existing 100MHz quartz crystal oscillator, the invention adopts a double-oscillation circuit to realize the 100MHz quartz crystal oscillator with high stability. The signal of a 10MHz crystal oscillation circuit with high stability is used as reference output, a 100MHz signal obtained by 10 frequency multiplication is used as an injection signal of a 100MHz quartz crystal oscillator, and the 10 frequency multiplication signal is locked in the oscillation circuit of the 100MHz quartz crystal oscillator, so that the signal output with high frequency stability can be achieved. The method combines the characteristics of high frequency stability of the 10MHz quartz crystal oscillator and low phase noise of the 100MHz quartz crystal oscillator, and improves the frequency stability of the quartz crystal oscillator by an injection locking method; under the condition of not influencing the phase noise of the original 100MHz quartz crystal oscillator, the near-end phase noise of the 100MHz quartz crystal oscillator signal can be improved.

(II) technical scheme

In order to achieve the purpose, the invention is realized by the following technical scheme: a method for improving the frequency stability of a quartz crystal oscillator comprises the following steps:

A: power supply input: inputting a power supply to a voltage stabilizing circuit, wherein the voltage stabilizing circuit outputs a stable voltage;

B: providing a stable voltage: the stable voltage output by the voltage stabilizing circuit is provided for a 10MHz oscillating circuit, a 10MHz10 frequency multiplication amplifying circuit, a 100MHz oscillating circuit, a 100MHz amplifying circuit, a temperature control circuit and the like;

c: signal amplification: the 10MHz oscillation circuit generates a 10MHz oscillation signal, and the 10MHz oscillation signal is injected into the 100MHz oscillation circuit after passing through the 10M10 frequency multiplication amplifying circuit;

D: and (3) signal output: the 100MHz oscillating circuit outputs 100MHz oscillating signal, which is output through 100HzM amplifying circuit and 100MHz filter circuit.

Optionally, in the step C, a 100MHz signal is obtained after 10 frequency multiplication of the 10MHz signal generated by the 10MHz oscillation circuit, the 100MHz signal is injected into a main oscillation triode of the 100MHz oscillation circuit, and the 10MHz frequency multiplication signal locks the 100MHz oscillation circuit.

Optionally, in the step C, the 10MHz oscillation signal is output by a 10MHz quartz crystal oscillator;

And D, outputting the 100MHz oscillation signal by a 100MHz quartz crystal oscillator.

Optionally, the 10MHz quartz crystal oscillator and the 100MHz quartz crystal oscillator are connected to an oscillation and temperature control circuit board, and the oscillation and temperature control circuit board is fixedly mounted on a crystal oscillator tube seat.

(III) advantageous effects

The invention provides a method for improving the frequency stability of a quartz crystal oscillator, which has the following beneficial effects:

(1) the 10MHz crystal oscillator has the characteristic of high frequency stability, and the 10MHz crystal oscillator can obtain a 100MHz signal with the same frequency stability as the 10MHz crystal oscillator signal after 10 frequency multiplication.

(2) And 10 frequency multiplication signals of the 10MHz crystal oscillator are injected into the 100MHz oscillating circuit, and the signals are locked in the 100MHz oscillating circuit, so that the 100MHz crystal oscillator outputs 100MHz signals with high frequency stability, and meanwhile, the near-end phase noise of the signal output of the 100MHz oscillating circuit is improved.

(3) and the 100MHz oscillation signal with high stability and low phase noise is realized by combining the characteristic of low phase noise of the 100MHz crystal oscillator.

Drawings

fig. 1 is a schematic block diagram of the circuit of the present invention.

FIG. 2 is a schematic diagram of signal injection locking according to the present invention.

Fig. 3 is a schematic view of the assembly of the product of the present invention.

FIG. 4 is a flowchart illustrating product debugging according to the present invention.

in the figure: 1. a 10MHz quartz crystal oscillator; 2. a 100MHz quartz crystal oscillator; 3. an oscillating and temperature-controlled circuit board; 4. a crystal oscillator tube seat.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention provides a method for improving the frequency stability of a quartz crystal oscillator as shown in figures 1-4, which comprises the following steps:

A: power supply input: inputting a power supply to a voltage stabilizing circuit, wherein the voltage stabilizing circuit outputs a stable voltage;

B: providing a stable voltage: the stable voltage output by the voltage stabilizing circuit is provided for a 10MHz oscillating circuit, a 10MHz10 frequency multiplication amplifying circuit, a 100MHz oscillating circuit, a 100MHz amplifying circuit, a temperature control circuit and the like;

C: signal amplification: the 10MHz oscillation circuit generates a 10MHz oscillation signal, and the 10MHz oscillation signal is injected into the 100MHz oscillation circuit after passing through the 10MHz10 frequency multiplication amplifying circuit;

D: and (3) signal output: the 100MHz oscillating circuit outputs 100MHz oscillating signal, which is output through 100MHz amplifying circuit and 100MHz filter circuit.

As an optional technical scheme of the invention:

And C, performing 10 frequency multiplication on the 10MHz signal generated by the 10MHz oscillating circuit to obtain a 100MHz signal, injecting the 100MHz signal into a main oscillation triode of the 100MHz oscillating circuit, and locking the 10MHz frequency multiplication signal to the 100MHz oscillating circuit to ensure the high-frequency stability of the 100MHz output signal.

As an optional technical scheme of the invention:

In the step C, a 10MHz oscillation signal is output by a 10MHz quartz crystal oscillator 1;

And D, outputting the 100MHz oscillation signal by the 100MHz quartz crystal oscillator 2.

as an optional technical scheme of the invention:

The 10MHz quartz crystal oscillator 1 and the 100MHz quartz crystal oscillator 2 are connected on an oscillation and temperature control circuit board 3, the oscillation and temperature control circuit board 3 is in a double-sided layout, two oscillation circuits, a frequency multiplication circuit, an amplification circuit, an inductor, a capacitor, a master oscillation triode, the quartz crystal oscillator 1, the 100MHz quartz crystal oscillator 2 and the like are arranged below the oscillation and temperature control circuit board 3, a voltage stabilizing circuit and a temperature control circuit are arranged above the oscillation and temperature control circuit board 3, and the oscillation and temperature control circuit board 3 is fixedly arranged on a crystal oscillator tube base.

When a product is debugged, firstly, a 100MHz injection signal after 10MHz frequency multiplication is disconnected, as shown in figure 2, the position of an A point is disconnected, the frequency of a 100MHz quartz crystal oscillator 2 is corrected, the frequency of a 10MHz quartz crystal oscillator 1 is corrected after stabilization, then, a frequency temperature stability test is carried out on a 10MHz oscillating circuit, the A point is connected, and then, the frequency temperature stability test is carried out on the 100MHz oscillating circuit.

it is noted that in the present disclosure, unless otherwise explicitly specified or limited, a first feature "on" or "under" a second feature may be directly contacted with the first and second features, or indirectly contacted with the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.