Demodulating apparatus with phase shift compenstion

Details Demodulating apparatus with phase shift compenstion Demodulating apparatus with phase shift compenstion

H - Electricity

03

D

329/3

H03D 3/18 (2006.01) H03D 1/00 (2006.01) H03D 1/04 (2006.01) H03D 1/22 (2006.01)

Patent

CA 1108250

ABSTRACT OF THE DISCLOSURE 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 for eliminating 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 limiter 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.

299419

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