Ultra linear frequency discriminator circuitry

摘要

Signals to be discriminated are supplied through a controllable attenuator and power splitter to first and second discriminators with response slopes which are equal and of opposite sign. The outputs of the discriminators are summed and a reference signal is subtracted from the sum to produce a control signal which adjusts the input attenuator to maintain the amplitude of the input signal constant. The outputs of the discriminators are also subtracted to provide an output signal which is a linear function of frequency and independent of input amplitude.