Carrier phase synchronizing circuit

Details Carrier phase synchronizing circuit Carrier phase synchronizing circuit

1997-04-25

1999-06-01

Kinkead, Arnold

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural oscillators controlled

331 23, 331 17, 375376, 455260, 455265, 4551922, 329306, 329307, H03L 700

Patent

active

059091487

ABSTRACT:
A carrier phase synchronizing circuit is disclosed, that comprises an AFC loop and a PLL, the AFC loop including an AFC complex multiplexing device, an LPF, a PLL complex multiplying device, a phase detector, a loop filter, an AFC filter, and a NCO, the PLL including a PLL multiplying device, a phase detector, a PLL filter, and a NCO. A loop range, a frequency control width, and a control time interval of each of the AFC filter and the PLL filter are controlled corresponding to a time change amount of the frequency error that is detected in the PLL.

REFERENCES:
patent: 4691176 (1987-09-01), Hsiung et al.
patent: 5241700 (1993-08-01), Geesen et al.

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