Oscillators – Automatic frequency stabilization using a phase or frequency... – Tuning compensation
Reexamination Certificate
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:
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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
Fayneh Eyal
Knoll Ernest
Chang Joseph
Fleshner & Kim LLP
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