High speed phase lock loop having constant bandwidth

Details High speed phase lock loop having constant bandwidth High speed phase lock loop having constant bandwidth

1997-08-29

1999-08-03

Wells, Kenneth B.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

331 25, 331DIG2, 375376, H03L 706

Patent

active

059330376

ABSTRACT:
A phase lock loop includes precision charge pump current generation circuit which provides a dynamically variable charge pump current to a charge pump. The charge pump current is developed from the VCO control voltage and varies in inverse proportionality to changes in the control voltage. The proportionality between the precision current and the control voltage is defined by a bias network and such that the current is inversely proportional to the VCO gain and the phase lock loop bandwidth is therefore maintained at a substantially constant value.

REFERENCES:
patent: 5144156 (1992-09-01), Kawasaki
patent: 5166641 (1992-11-01), Davis
patent: 5675292 (1997-10-01), McCune
patent: 5703511 (1997-12-01), Okamoto
patent: 5727037 (1998-03-01), Maneatis

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