FM discriminator having low noise characteristics

Details FM discriminator having low noise characteristics FM discriminator having low noise characteristics

1976-02-09

1977-07-12

Kominski, John

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

331 2, 331 19, H03D 300

Patent

active

040357368

ABSTRACT:
A low noise discriminator circuit having particular utility for use in determining the spectral purity characteristics of an rf signal source and comprising, in addition to standard discriminator components, a down-locked reference signal source including a voltage-controlled signal generator for developing a reference signal and a corresponding train of signal pulses, a stabilizing voltage-controlled oscillator which responds to the discriminator error signal and generates a stabilizing signal having a frequency at least an order of magnitude greater than the frequency of the reference signal, and a sampling phase detector which samples the stabilizing signal at the signal pulse frequency and develops a control signal which is fed through a feed-back loop to stabilize the reference signal generator.

REFERENCES:
patent: 3600683 (1971-08-01), Martin

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