Demodulators – Amplitude modulation demodulator – Having specific distortion – noise or other interference...
Patent
1982-08-10
1985-03-26
LaRoche, Eugene R.
Demodulators
Amplitude modulation demodulator
Having specific distortion, noise or other interference...
329123, 329124, 331 12, 331 17, 331 23, 375 52, 375 83, 375120, H04L 2722, H04L 702, H03L 708, H03D 318
Patent
active
045076170
ABSTRACT:
A carrier recovery circuit for use in a demodulator for a 2.sup.n -phase PSK modulated signal which comprises a phase-locked loop including a voltage-controlled oscillator (7) and an automatic frequency control (AFC) loop for avoiding the false lock phenomenon. The AFC loop is comprised of two differentiating circuits (21, 25), two mixer circuits (22, 26), and a difference circuit (27), and forms a symmetrical structure so as to exclude undesired noise, thereby carrying out a stable AFC operation.
REFERENCES:
patent: 3568067 (1971-03-01), Williford
patent: 3748590 (1973-07-01), Gray
patent: 4027274 (1977-05-01), Fukui et al.
patent: 4100503 (1978-07-01), Lindsey et al.
patent: 4107623 (1978-08-01), Graf et al.
patent: 4180779 (1979-12-01), Hook et al.
patent: 4388596 (1983-06-01), Yamashita
patent: 4394626 (1983-07-01), Kurihara et al.
patent: 4419759 (1983-12-01), Poklemba
(Japanese Language Pub., Author not known), "One Consideration of an AFC Circuit in a Costas Type Carrier Recovery Circuit", Electronic Communication Society, Communication Division.
Fujitsu Limited
LaRoche Eugene R.
Paxman W. R.
LandOfFree
Carrier recovery circuit for a PSK modulated signal does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Carrier recovery circuit for a PSK modulated signal, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Carrier recovery circuit for a PSK modulated signal will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1296337