振荡频率偏移侦测方法以及振荡频率偏移侦测电路;METHOD AND CIRCUIT FOR DETECTING FREQUENCY DEVIATION OF OSCILLATOR

摘要

一种振荡频率偏移侦测方法及其电路，该方法包含：接收具有一振荡频率之一振荡讯号；根据该振荡讯号来产生一自混合讯号；对该自混合讯号进行除频来产生一降频自混合讯号；求出该降频自混合讯号的一特定频率范围内具有最大能量的一降频自混合频率；以及至少根据该振荡频率以及该降频自混合频率来计算该振荡频率的一频率偏移量。; generating a self-mixing signal according to the oscillating signal; performing a frequency division upon the self-mixing signal to obtain a down-conversion self-mixing signal; obtaining a down-conversion self-mixing frequency having a maximum power in a specific frequency range of the down-conversion self-mixing signal; and computing a frequency deviation value of the oscillating frequency according to at least the oscillating frequency and the down-conversion self-mixing frequency.