公开(公告)号：US3997848A

公开(公告)日：1976-12-14

申请号：US635531

申请日：1975-11-26

申请人： Ronnie R. Rippy

发明人： Ronnie R. Rippy

IPC分类号： H03D3/24 ,  H04L27/00 ,  H04L27/227 ,  H03C3/22 ,  H03D3/20

CPC分类号： H03D3/24 ,  H04L27/2273 ,  H04L2027/0044 ,  H04L2027/0051 ,  H04L2027/0067

摘要： A phase modulated wave that may have no carrier power is demodulated by a phase locked loop including a phase detector for deriving an A.C. data output signal having a magnitude and a phase indicative of the phase of the modulated wave. A feedback loop responsive to the data output signal restores power to the carrier frequency component to the loop. In one embodiment, the feedback loop includes a phase modulator responsive to the phase modulated wave and the data output signal. In a second embodiment, carrier frequency power is restored by differentiating the data output signal and supplying the differentiated signal to an input of a voltage controlled oscillator included in the phase locked loop. Preferably, the phase modulator is linear and includes a series inductance-capacitance network, wherein the capacitor is a voltage controlled varactor. To compensate for nonlinearities in the varactor reactance vs. voltage characteristic, the series circuit is shunted by a properly selected inductance.

摘要翻译： 可以不具有载波功率的相位调制波由包括相位检测器的锁相环解调，该相位检测器用于导出具有表示调制波的相位的幅度和相位的交点数据输出信号。 响应于数据输出信号的反馈回路恢复到载波频率分量到环路的功率。 在一个实施例中，反馈回路包括响应于相位调制波和数据输出信号的相位调制器。 在第二实施例中，通过差分数据输出信号并将微分信号提供给包括在锁相环中的压控振荡器的输入来恢复载波频率功率。 优选地，相位调制器是线性的并且包括串联的电感 - 电容网络，其中电容器是电压控制的变容二极管。 为了补偿变容二极管电抗与电压特性的非线性，串联电路由适当选择的电感分流。