Apparatus and method for producing symmetric capture range in tw

Details Apparatus and method for producing symmetric capture range in tw Apparatus and method for producing symmetric capture range in tw

1997-07-30

1998-12-08

Le, Dinh

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By phase

327 12, 327156, 327147, 327 2, 331 27, H03L 708

Patent

active

058475826

ABSTRACT:
A symmetric capture range is produced in a two-quadrant phase detector phase locked loop that utilizes nonsymmetric pulse waves. The phase detector is enabled only during VCO pulses. A latch stores the relative relationship between the leading edge of the input pulse and the center of the VCO pulse in the previous cycle. If the phase angle .theta. form the VCO pulse center to the leading edge of the input pulse is

REFERENCES:
patent: 4464771 (1984-08-01), Sorensen
patent: 4577163 (1986-03-01), Culp
patent: 5192915 (1993-03-01), Mathieu et al.

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