High-performance charge pump for self-biased phase-locked loop

Details High-performance charge pump for self-biased phase-locked loop High-performance charge pump for self-biased phase-locked loop

2005-05-17

2005-05-17

Chang, Joseph (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

C331S017000, C327S157000

Reexamination Certificate

active

06894569

ABSTRACT:
A charge pump includes a charge circuit switch, a pump circuit switch, and a controller for generating a first control signal for switching the charge circuit switch and a second control signal for switching the pump circuit. In order to reduce the effects of self-jitter and improve signal quality, the controller generates the first and second control signals so that they have a same amplitude and slew rate. This results in improving steady-state phase error (DC skew). To further improve performance, current sources of the charge pump are controlled to operate continuously. This advantageously minimizes parastic switching currents. The charge pump may be incorporated within a phase-locked loop for purposes of generating frequency signals. The phase-locked loop may be self-biased. A processing system having, for example, a microprocessor-based computing architecture may advantageously include the phase-locked loop for performing any one of a variety of applications.

REFERENCES:
patent: 5740213 (1998-04-01), Dreyer
patent: 5870003 (1999-02-01), Boerstler
patent: 6107849 (2000-08-01), Williams et al.
patent: 6229362 (2001-05-01), Choi
patent: 6329882 (2001-12-01), Fayneh et al.
patent: 20010013801 (2001-08-01), Johnson

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