Carrier regeneration circuit including area judging device

Details Carrier regeneration circuit including area judging device Carrier regeneration circuit including area judging device

1995-11-30

1997-01-14

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

331 17, 329309, 375326, 375327, 375376, H03L 7085, H04L 2738

Patent

active

055943896

ABSTRACT:
A carrier regeneration circuit achieves quick frequency synchronization without using a sweeper. An area judging device judges whether a baseband signal, quadrature-demodulated with a regenerated carrier output from a voltage-controlled oscillator, lies inside a designated area in a phase plane. If it is inside the designated area, an output of a phase comparator is selected, and if it has exited the area, the previous value is held. The designated area is set so that the direction of control indicated by the phase comparator, just before the baseband signal rotating in the phase plane exits the area, coincides with a direction that suppresses the rotation.

REFERENCES:
patent: 4571550 (1986-02-01), Head
patent: 4574246 (1986-03-01), Yoshida
patent: 5519733 (1996-05-01), Huang

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