Phase-Locked Loop

Details Phase-Locked Loop Phase-Locked Loop

2006-05-30

2006-05-30

Chin, Stephen (Department: 2634)

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

C375S373000

Reexamination Certificate

active

07054403

ABSTRACT:
A phase lock circuit has a signal path to which a phase comparator, a loop filter and a voltage control oscillator are connected in series, the phase comparator being adapted to compare the phase of an input signal VINwith the phase in the output signal of the voltage control oscillator and to output its result of comparison, the loop filter being adapted to receive the output signal of the phase comparator and to output a DC voltage; the voltage control oscillator being adapted to control the output oscillation frequency depending on the DC output voltage of the loop filter, the phase lock circuit further comprising voltage tracking means for adding, to the voltage of the signal path, a signal causing the average voltage in the output voltage of the phase comparator to coincide with a predetermined reference voltage, whereby the voltage tracking means can enlarge the lock range in the phase lock circuit.

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