Frequency/phase analog detector and its use in a phase-locked lo

Details Frequency/phase analog detector and its use in a phase-locked lo Frequency/phase analog detector and its use in a phase-locked lo

1988-04-06

1995-10-17

Moskowitz, Nelson

Demodulators

Phase shift keying or quadrature amplitude demodulator

Input signal combined with local oscillator or carrier...

331 11, G01R 2926, G01S 902

Patent

active

054594316

ABSTRACT:
A frequency/phase detector for a reference signal with a fixed frequency and a second signal with a variable frequency comprises essentially a frequency discriminator, already known, in which the output signal of a frequency-dependent phase-shifting circuit centered on said fixed frequency is applied, not directly to a demodulator circuit but through a summing circuit that receives in addition said reference signal.

REFERENCES:
patent: 3927405 (1975-12-01), Poinsard et al.
patent: 3996588 (1976-12-01), Besson et al.

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