一种新的高频泛音晶体振荡器温度补偿方法

提出了一种新的高频泛音晶体振荡器温度补偿的方法,它能克服了目前泛音晶振温补中均采用加电感和倍频的方法带来的稳定度下降和相噪恶化的缺点。该系统利用低频陶瓷振荡器的输出频率通过混频对高次泛音石英晶振进行温度补偿。系统采用微机控制开关电容阵,有利于集成。初步补偿结果表明,利用本文提出的补偿方法进行补偿的100MHz五次泛音石英晶体振荡器在0～70℃温度范围内频率-温度稳定性≤±2×10-6。

A Novel Temperature Compensating Method for High-Frequency Overtone Crystal Oscillator

A no vel temperature compensat ing method fo r high - frequency ov er to ne crystal o scillator w illbe presented. This method can overcome the disadvantage of f requency stability decline and phase noisedeterior ated that broug ht by adding inductance and fr equency mult iplicat ion in current hig h - f requencyovertone temperature compensated crystal oscillator . T o realize the temperature compensat io n for high- f requency o vertone cry stal oscillator , low - f requency ceramic oscillator is chosen and its output f requencyis mix ed w ith the output frequency of overtone cry stal o scil lator . T he fr equence deviat ion ofoverton cry stal oscillator is direct ly compensated by the o utput f requency of ceramic oscillato r . T he experimentalcompensating result show s that using this method the f requency - temperature stability of100 MHz 5 th overtone temperature compensated cr ystal oscillator can achieve [ ? 2 @ 1 0- 6 , in thetemperature r ange 0~ 70 e .