Demodulating apparatus with phase shift compensation

Details Demodulating apparatus with phase shift compensation Demodulating apparatus with phase shift compensation

1978-03-29

1979-07-31

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329101, 329137, 329140, 329145, 329194, H03D 106, H03D 318

Patent

active

041631960

ABSTRACT:
Demodulating apparatus for a modulated signal comprised of a carrier deriving circuit which is supplied with the modulated signal and which derives an unmodulated carrier therefrom, the carrier deriving circuit including a tuned circuit having a center frequency substantially coincident with the carrier frequency of the modulated signal and a limiter circuit in which the limiter circuit imparts a phase shift to the signal supplied thereto in connection with its elimination of the amplitude fluctuations in the signal produced by the tuned circuit. A synchronous detector receives the modulated signal and the derived carrier so as to detect the modulated signal with the derived carrier. A phase shift circuit supplies the synchronous detector with a phase shifted modulated signal, the phase shift substantially compensating for the phase shift imparted by the limited circuit in the carrier deriving circuit, whereby the modulated signal and the carrier which are applied to the synchronous detector are substantially in phase with each other.

REFERENCES:
patent: 2227902 (1941-01-01), Hahnle
patent: 3603890 (1971-09-01), Camenzind et al.
patent: 3921073 (1975-11-01), Pexa

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