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本文从工程角度对在移动通信中利用谐振回路调相间接调频方式进行了分析,指出了在实际应用中由于环境温度引起的谐振频率漂移使这种方式不容易在满足一定调制频偏情况下获得比较小的调制失真。文中分析了脉冲调相间接调频器的原理和特性,介绍了该方法在移动电台中用锁相环倍频的调频器的主要性能和实际方框图。
In this paper, from the engineering point of view, the use of resonant circuit in the mobile communication phase modulation indirect frequency modulation was analyzed, and pointed out that in practice due to the ambient temperature resonant frequency drift makes this approach is not easy to meet certain modulation frequency offset Smaller modulation distortion. In this paper, the principle and characteristics of pulse phase-modulated indirect frequency modulator are analyzed. The main performance and practical block diagram of the frequency-doubler-based frequency hopper with this method in mobile station are introduced.