Pulse or digital communications – Receivers – Automatic frequency control
Patent
1994-12-28
1997-03-18
Chin, Stephen
Pulse or digital communications
Receivers
Automatic frequency control
375329, 329306, 4551641, 4551822, 4551922, H04L 2706
Patent
active
056129777
ABSTRACT:
A frequency control circuit for a receiver of phase shift keying (PSK) modulated signals comprises intermediate frequency (IF) signal generation circuit for generating an IF signal from a local oscillation signal. A measurement circuit measures the frequency of the IF signal. A detection circuit detects the frequency shift due to the PSK modulation to output a frequency shift signal in response to a first control signal. A control circuit detects that the frequency of the IF signal is converged until the detection circuit can detect the frequency shift due to the PSK modulation. A frequency control circuit further comprises an arithmetic operation circuit for detecting the frequency of the IF signal which can not be affected by the frequency shift due to the PSK modulation, a local oscillation signal generation circuit for outputting a local oscillation frequency signal in accordance with a second control signal, and a compensation circuit for compensating the second control signal in order to converge the frequency of the IF signal on a desired frequency.
REFERENCES:
patent: 5325401 (1994-06-01), Halik et al.
patent: 5513388 (1996-04-01), Suganuma
patent: 5517678 (1996-05-01), Klank et al.
Chin Stephen
NEC Corporation
Vo Don
LandOfFree
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