Circuit for extracting carrier signals

Details Circuit for extracting carrier signals Circuit for extracting carrier signals

1987-12-08

1989-12-26

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

329300, 375 86, H03D 306

Patent

active

048903027

ABSTRACT:
In circuits for reproducing carriers for continuous phase modulation having a rational modulation index these signals are multiplied in a multiplier for producing a harmonic, with unique phases occurring due to phase addition irrespective of the information to be conveyed. This harmonic is selected by means of a bandpass filter and supplied to a divider for reproducing the carrier signal. However, as the desired phases only occur at certain instants the effect of jitter in the reproduced carrier signal is undesirably high.
Jitter suppression is considerably improved by supplying to the bandpass filter only the instantaneous values of the virtually desired phases occurring at the specific instants.

REFERENCES:
patent: 3835404 (1974-09-01), Nakamura et al.
patent: 4339725 (1982-07-01), Ichiyoshi

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