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A kind of crystal oscillator anti-vibration compensation device and method based on binary code
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A technology of crystal oscillators and binary codes, applied in power oscillators, automatic control of power, electrical components, etc., can solve the problems of low precision of AVXO, achieve simple compensation structure, easy integration and mass production, and simple compensation process Effect
Active Publication Date: 2022-05-24
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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[0012] The purpose of the present invention is to solve the problem of low accuracy of the existing open-loop compensation AVXO, and proposes a crystal oscillator anti-vibration compensation device and method based on binary codes, and realizes anti-vibration crystal oscillation by adopting a closed-loop compensation framework high precision digital compensation of
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Embodiment 1
[0045] The embodiment of the present invention provides a crystal oscillator anti-vibration compensation device based on binary coding, such as figure 1 As shown, it includes a voltage-controlled crystal oscillator, a power divider, a microprocessor (MCU), a frequency-to-voltage conversion circuit, a signal adjustment circuit and a filter that are sequentially connected and form a closed-loop structure.
[0046] The voltage controlled crystal oscillator is used to generate a stable oscillation frequency signal and output it to the power divider.
[0047] The power divider is used to divide the output signal of the voltage-controlled crystal oscillator into two channels, one of which is used as the output signal of the anti-vibration compensation device of the crystal oscillator, and the other is output to the microprocessor.
[0048] The microprocessor is used to acquire the nominal frequency f of the VCO 0 and real-time output frequency Compare the frequency change Simul...
Embodiment 2
[0055] The embodiment of the present invention provides a method for anti-vibration compensation of a crystal oscillator based on binary coding, such as image 3 shown, including the following steps S1-S8:
[0056] S1. Under non-vibration conditions, the voltage control voltage V is applied to the voltage control terminal of the voltage controlled crystal oscillator c0 , so that it outputs the nominal frequency f 0 , and use the microprocessor to collect the nominal frequency f 0 .
[0057] S2, according to the nominal frequency f 0 , the binary code of the output frequency of the voltage-controlled crystal oscillator under the vibration condition is established by the microprocessor with frequency change Correspondence table of
[0058] Step S2 includes the following sub-steps S21-S24:
[0059] S21. Change the vibration condition of the voltage-controlled crystal oscillator so that its vibration acceleration is Collect the real-time output frequency of the voltag...
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Abstract
The invention discloses a crystal oscillator anti-vibration compensation device and method based on binary code, which is formed by sequentially connecting a voltage-controlled crystal oscillator, a power divider, a microprocessor, a frequency-voltage conversion circuit, a signal adjustment circuit and a filter Closed-loop compensation structure, the frequency variation is directly generated by the microprocessor, and converted into the corresponding compensation voltage difference by the frequency-voltage conversion circuit, which makes it easier to realize real-time high-precision compensation. The invention does not need an acceleration sensor, but directly establishes a relationship between the real-time output frequency of the voltage-controlled crystal oscillator and the vibration condition, and can overcome the hysteresis problem caused by the use of an external acceleration sensor in the existing anti-vibration crystal oscillator. The compensation process of the invention is simple, the compensation structure is relatively simple, and it is easy to be integrated and produced in batches. The invention can be well applied to crystal oscillators of various frequencies, especially for high-frequency crystal oscillators with poor compensation effects in the prior art, and has strong practicability.
Description
technical field [0001] The invention belongs to the technical field of crystal oscillators, and in particular relates to the design of an anti-vibration compensation device and method for a crystal oscillator based on binary coding. Background technique [0002] Anti-vibration crystal oscillator (AVXO for short) is a crystal oscillator that can work in a specific vibration environment and maintain the output frequency of the crystal oscillator within a certain accuracy range through a certain method. It has the characteristics of low phase noise and high stability, and is widely used in various communications, navigation, radar, satellite positioning systems, mobile communications and various electronic measuring instruments. [0003] AVXO is essentially a voltage-controlled crystal oscillator (Voltage Controlled crystal Oscillator, hereinafter referred to as VCXO) with a vibration compensation network that generates a compensation voltage related to vibration. The uncompen...
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