One bit digital phase shift keyed carrier recovery and demodulat

Details One bit digital phase shift keyed carrier recovery and demodulat One bit digital phase shift keyed carrier recovery and demodulat

1998-12-15

2000-12-19

Kinkead, Arnold

Demodulators

Phase shift keying or quadrature amplitude demodulator

329307, 329310, 331 12, 375326, 375331, 375327, 375329, H03D 318, H03D 300

Patent

active

061632082

ABSTRACT:
A phase shift keyed carrier recovery and demodulator circuit which includes a phase detector and subsequent feedback control loop circuitry which maintains an initial phase relationship. By comparing an incoming phase modulated carrier with the multiple phase outputs of a local oscillator, the circuit is able to generate a correcting signal which allows coherent phase tracking of the incoming phase modulated carrier. The phase detector produces a correction signal which allows the circuit to phase lock any two sequential phases of the locally generated phase outputs to phase positions on either side of the phase of the incoming phase modulated carrier. Once the circuit has obtained carrier phase lock, the multiple phases produced by the local oscillator will remain fixed (without phase change) relative to the initial detected phase of the incoming phase modulated carrier. Since the local oscillator is fixed (locked) to the phase of the incoming phase modulated carrier, demodulation can be accomplished simply by clocking one or more flip flops with respective phases of the local oscillator.

REFERENCES:
patent: 5121070 (1992-06-01), Tomita
patent: 5241567 (1993-08-01), Shimakata
patent: 5355092 (1994-10-01), Kosaka et al.
patent: 5625652 (1997-04-01), Petranovich

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