Phase detector and frequency demodulator including such a phase

Details Phase detector and frequency demodulator including such a phase Phase detector and frequency demodulator including such a phase

1989-09-25

1990-11-13

Mis, David

Demodulators

Frequency modulation demodulator

Input signal combined with local oscillator or carrier...

329336, H03D 306

Patent

active

049704699

ABSTRACT:
Phase detector having a first input for an angle-modulated input carrier to be detected, and a second input for a reference carrier having a phase shift which is dependent on the angle modulation with respect to the input carrier, the input and reference carriers being at least multiplied in the phase detector, and a frequency demodulator including such a phase detector. In order to inhibit signal distortion and notably second-order interference products in the demodulation of an angle-modulated input carrier, the phase detector according to the invention is adapted to derive an in-phase carrier A and a phase quadrature carrier B from the input carrier and to derive an in-phase carrier C and a phase quadrature carrier D from the reference carrier which has a phase which, at an average, is equal or opposite to that of the input carrier, while the phase detector is further adapted to supply from its output a signal which substantially corresponds to AC-BD.

REFERENCES:
patent: 4339726 (1982-07-01), Miura

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