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发明背景1.发明范围本发明叙述的锁相环,一般是指晶体锁相环,尤其是指窄带接收机使用的晶体控制锁相环。2.已发表的技术叙述锁相环技术应用于能对频移键控信号作最佳解调的宽带频移键控系统。它有一个压控振荡器,该振荡器产生的信号频率与加给它输入
BACKGROUND OF THE INVENTION 1. Scope of the Invention The phase-locked loop described in the present invention generally refers to a crystal phase-locked loop, and more particularly to a crystal-controlled phase-locked loop used in a narrow-band receiver. 2. Published Technical Description Phase locked loop technology is applied to a wideband frequency shift keying system that can optimally demodulate a frequency shift keying signal. It has a voltage-controlled oscillator, the oscillator frequency of the signal generated plus the input to it