Circuit for extracting carrier signals
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United States of America Patent
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-
Dec 26, 1989
Grant Date -
N/A
app pub date -
Dec 8, 1987
filing date -
Dec 8, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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