Heterodyne receiver

Details Heterodyne receiver Heterodyne receiver

1995-10-19

1998-07-14

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

4551841, 4551921, H04B 118

Patent

active

057818517

ABSTRACT:
A heterodyne receiver of the present invention is of a heterodyne system including a voltage controlled circuit and a phase locked loop circuit. The receiver further includes a tuned voltage signal compensating circuit adapted to deliver a frequency passband compensating signal to a bandpass filter on the basis of a variation of an output signal obtained as a result of comparison made between a tuned voltage signal from the phase locked loop circuit and a detected signal from a detector. The heterodyne circuit can obtain a stable nearby frequency selectivity characteristic even in the case where there arises a temperature variation in the receiver.

REFERENCES:
patent: 5027431 (1991-06-01), Tanaka et al.
patent: 5263187 (1993-11-01), Sugawa et al.

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