PLL circuit

Details PLL circuit PLL circuit

1998-10-15

2000-11-14

Lam, Tuan T.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

327107, 331 11, H03L 706

Patent

active

061475300

ABSTRACT:
In a PLL circuit, a phase comparator compares phases between a data signal train and a regenerated clock generated within the PLL circuit based on a clock with which the data signal train is synchronizing, and outputs a phase error signal. A frequency comparator compares frequencies between the data stream signal and the regenerated clock and outputs a frequency error signal. When the frequency difference between the both is large, only the frequency system loop operates to carry out a frequency pull in operation of the regenerated clock. When the frequency difference becomes smaller than a predetermined value, an operation by the phase system loop is added to carry out a phase pull in operation. When the phase difference becomes a predetermined value, the phase is locked. When the frequency difference exceeds the predetermined value again during the phase locked period, the operation of the phase system loop is suspended and only the frequency system loop carries out the frequency pull in operation.

REFERENCES:
patent: 5574406 (1996-11-01), Sauer et al.

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