Anti-vibration crystal oscillator

Abstract

The invention discloses an anti-vibration crystal oscillator, and the crystal oscillator adopts a closed-loop compensation framework based on a digital circuit to realize high-precision compensation of the crystal oscillator. Firstly, an output signal of an acceleration compensation crystal oscillator is divided into two paths by a power divider: one path is outputted, and the other path is sent to a phase detector to extract a phase signal, is converted into a phase value in a binary coding form by an analog-to-digital converter, and then is transmitted into a microprocessor; a pre-stored phase value-compensation voltage value binary coding table is used for looking up a table to obtain a binary code of a required compensation voltage value, and then the binary code of the compensation voltage value is converted into a required compensation voltage by a digital-to-analog converter, and the required compensation voltage is inputted to the voltage control end of the voltage-controlled crystal oscillator, so the oscillator outputs a signal with a stable phase and finally acceleration compensation is realized, and the problem of phase error caused by inconsistency and asynchronism ofacceleration acquired by a sensor and real-time acceleration of a resonance wafer in the conventional acceleration compensation crystal oscillator is solved.

Description

technical field [0001] The invention belongs to the technical field of crystal oscillators, and more specifically relates to an anti-vibration crystal oscillator. 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 a relatively constant output phase of the crystal oscillator in a certain way. 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] The anti-vibration crystal oscillator is essentially a voltage-controlled crystal oscillator (Voltage Controlled crystal Oscillator, hereinafter referred to as VCXO) with a vibration compensation network that generates a vibration-related compensation voltage. Since the crystal oscillator is a device that is extremely sensitive to vib...

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Problems solved by technology

[0011] Obviously, the anti-vibration crystal oscillator of the existing active compensation network based on the acceleration sensor adopts an open-loop compensation framework, and an acceleration sensor is used, which is as close as possible to the crystal resonator on the circuit, and the crystal resonator The resonator of the oscillator is individually packaged in a closed space, which inevitably produces hysteresis, which has a significant impact on the compensation accuracy of the anti-vibration crystal oscillator

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