Automatic gain controlled frequency discriminator for use in a p

Details Automatic gain controlled frequency discriminator for use in a p Automatic gain controlled frequency discriminator for use in a p

1983-04-22

1985-04-09

Laroche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Amplitude compensation

331 25, 331 40, 331 41, 328133, 343 5AF, H03L 702

Patent

active

045104638

ABSTRACT:
A frequency discriminator having a wide capture band is shown to comprise, in addition to a conventional phase detector having two channels fed by a signal whose frequency is to be determined (the first one of the channels containing a tuned circuit operative to shift the phase of the signal in accordance with the difference between the frequency of the signal and the center frequency of the tuned circuit and the second one of the channels containing a phase shifter operative to shift the phase of the signal by 90.degree. regardless of the frequency of the signal), a compensating circuit operative substantially to equalize the amplitudes of the signals applied to the phase detector, the compensating circuit including an amplifier in the first one of the channels to amplify the signal out of the tuned circuit, the gain of the amplifier being controlled by a signal indicative of the difference between the amplitudes of the signals fed to the phase detector.

REFERENCES:
patent: 3593181 (1971-07-01), Kuhn
patent: 3882413 (1975-05-01), Healey
patent: 4159475 (1979-06-01), Andre et al.
patent: 4336505 (1982-06-01), Meyer

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