Digital PLL circuit

Details Digital PLL circuit Digital PLL circuit

1998-10-06

2000-07-11

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

327159, 375360, 375375, H03L 706

Patent

active

06087869&

ABSTRACT:
A digital PLL circuit recovers a clock signal from an analog baseband signal. The PLL circuit has a phase comparator. The phase comparator provides a loop filter with a control value for a period of the recovered clock signal after a determination is made. If the determination is that the baseband signal has crossed a transition level, the control value corresponds to a time difference between a sampling point and a transition-level crossing point of the baseband signal. If the determination is that the baseband signal has not crossed the transition level, the control value is 0. The PLL circuit shortens a lockup time and provides stable operation even if the baseband signal involves an offset.

REFERENCES:
patent: 5208839 (1993-05-01), Hladik et al.
patent: 5646968 (1997-07-01), Kovacs et al.
patent: 5663688 (1997-09-01), Delmas et al.
patent: 5745530 (1998-04-01), Baek et al.
patent: 5777498 (1998-07-01), Cometti et al.
patent: 5838202 (1998-11-01), Kosiec et al.
patent: 5858551 (1999-01-01), Ohishi et al.

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