Foster-Seeley discriminator circuit
The Foster-Seeley discriminator is also known as a mutual inductance coupled phase discriminator.
The discriminator is a frequency demodulator made by utilizing the characteristic that the amplitude frequency of the circuit in the useful frequency band has a linear slope.
A frequency discriminator that makes the output voltage correspond to the frequency of the input signal. According to the use, it can be divided into two categories. The first type is used for demodulation of frequency modulated signals. Commonly, there are slope discriminators, phase discriminators, proportional discriminators, etc. The requirements for such circuits are mainly small nonlinear distortion and low noise threshold. The second category is used for frequency error measurements, such as discriminators used to generate error signals in automatic frequency control loops. The zero-point drift limit for such circuits is strict, and the nonlinear distortion and noise thresholds are not required.
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