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Analog anti-vibration crystal oscillator compensation device and method

A technology of crystal oscillators and compensation devices, applied in power oscillators, electrical components, etc., can solve the problems of low AVXO accuracy and achieve the effects of simple compensation structure, simple compensation process, easy integration and mass production

Pending Publication Date: 2020-02-14
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0012] The purpose of the present invention is to solve the problem of low accuracy of the existing open-loop compensation AVXO, and proposes an analog anti-vibration crystal oscillator compensation device and method, and realizes the anti-vibration crystal oscillator by adopting a closed-loop compensation framework. High precision digital compensation

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  • Analog anti-vibration crystal oscillator compensation device and method
  • Analog anti-vibration crystal oscillator compensation device and method
  • Analog anti-vibration crystal oscillator compensation device and method

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Embodiment 1

[0043] An embodiment of the present invention provides an analog anti-vibration crystal oscillator compensation device, such as figure 1 As shown, it includes a voltage-controlled crystal oscillator, a power divider, a high-frequency frequency-to-voltage conversion circuit, a voltage comparison circuit, an adder and a filter that are connected in sequence to form a closed-loop structure.

[0044] The voltage-controlled crystal oscillator is used to generate a stable oscillation frequency signal and output it to the power divider.

[0045] 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 analog anti-vibration crystal oscillator compensation device, and the other is output to the high-frequency frequency-voltage conversion circuit.

[0046] The high-frequency frequency-to-voltage conversion circuit is used to collect the nominal frequency f of the voltage-control...

Embodiment 2

[0055] An embodiment of the present invention provides an analog anti-vibration crystal oscillator compensation method, such as Figure 5 As shown, the following steps S1-S7 are included:

[0056] S1. Under non-vibration conditions, apply a voltage control voltage V to the voltage control terminal of the voltage-controlled crystal oscillator c0 , so that it outputs the nominal frequency f 0 , and through the high-frequency frequency to voltage conversion circuit, the nominal frequency f 0 converted to the reference voltage V ref .

[0057] S2. Under vibration conditions, the real-time output frequency of the voltage-controlled crystal oscillator is divided by the power divider It is divided into two circuits, one of which is used as the output signal of the analog anti-vibration crystal oscillator compensation device, and the other is output to the high-frequency frequency-voltage conversion circuit.

[0058] S3, through the high-frequency frequency to voltage conversion...

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Abstract

The invention discloses an analog anti-vibration crystal oscillator compensation device and method. A voltage-controlled crystal oscillator, a power divider, a high-frequency frequency-voltage conversion circuit, a voltage comparison circuit, an adder and a filter are connected in sequence to form a closed-loop compensation framework, frequency is directly associated with compensation voltage through the high-frequency frequency-voltage conversion circuit, and real-time high-precision compensation is easier to achieve. An acceleration sensor is not needed, the frequency related to vibration inreal time is directly converted into the compensation voltage in one-to-one correspondence with the frequency for compensation, and the hysteresis problem caused by asynchronous acceleration when anacceleration sensor and a crystal resonator wafer are used in an existing anti-vibration crystal oscillator can be solved. The compensation process and the compensation structure are simple, integration and batch production are easy. The invention can be well suitable for crystal oscillators of various frequencies, and especially for high-frequency crystal oscillators poor in compensation effect..

Description

technical field [0001] The invention belongs to the technical field of crystal oscillators, and in particular relates to the design of an analog anti-vibration crystal oscillator compensation device and method. Background technique [0002] An 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 range of accuracy 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 to generate a vibration-related compensation voltage. The uncompensated voltage-controll...

Claims

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Application Information

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IPC IPC(8): H03B5/04
CPCH03B5/04
Inventor 谭峰邱渡裕黄武煌张沁川叶芃杨扩军潘卉青
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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