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本文介绍了对载频为660MHz～760MHz,调制频率为1kHz～50kHz,调频、调相两种调制方式的调制信号,使用ECL数字式鉴频—鉴相器E12040来达到较为理想的,低门限锁相鉴频技术。该锁相环路进入相位锁定之后和一般的高增益二阶环相仿,由于环路中采用鉴频—鉴相器,可以大大缩短环路的频率扑捉时间,扩展环路的扑捉带,并且不会产生错锁。电路简单、调试方便、性能稳定可靠。文中给出了环路有关参数的计算,实验数据及电路图。
This article describes the modulation of the carrier frequency of 660MHz ~ 760MHz, the modulation frequency of 1kHz ~ 50kHz, FM, phase modulation modulation of the two signals, the use of ECL digital phase frequency detector - phase detector E12040 to achieve the desired low-threshold lock Phase frequency technology. Phase-locked loop into the phase lock and the general high-gain second-order ring is similar to the loop as the use of frequency - phase detector can greatly reduce the frequency of the loop to capture the time to expand the loop to catch the catch, And will not produce a wrong lock. Simple circuit, convenient debugging, stable and reliable performance. The paper gives the calculation of loop-related parameters, experimental data and circuit diagram.