Phase demodulator including variable phase shifter for controlli

Details Phase demodulator including variable phase shifter for controlli Phase demodulator including variable phase shifter for controlli

1983-10-21

1985-10-22

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329124, 331 12, 331 23, H03D 300

Patent

active

045491429

ABSTRACT:
The outputs of respective phase detectors in an orthogonal phase detector circuit are subjected to A/D conversion, and selected bits from each A/D converter are logically combined not only to recover the reference carrier but also to detect any non-orthogonality of the carriers provided to the phase detectors. The phase shifter for providing the orthogonal reference carrier to the second phase detector is a variable phase shifter controlled in accordance with a control signal, with the control signal being adjusted in accordance with the detected non-orthogonality condition.

REFERENCES:
patent: 4057762 (1977-11-01), Namiki
patent: 4470147 (1984-09-01), Goatcher

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