Demodulator Lead Networks

One of the possible types of compensating networks for carrier-frequency servo systems is the demodulator lead network. By means of synchronous switching, a nonlinear operation is performed on the envelope of the input. For the case of very high carrier-to-signal-frequency ratio, an equivalent linear circuit is derived which is that of a typical dc lead network. The response to a step input in conjunction with quasi-stationary Fourier analysis and description of function methods is used to derive the circuit elements. The equivalent circuit is verified experimentally and its range of validity discussed.