Low offset and low glitch energy charge pump and method of...

Details Low offset and low glitch energy charge pump and method of... Low offset and low glitch energy charge pump and method of...

2006-06-06

2006-06-06

Kinkead, Arnold (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

C331S017000, C331S034000, C331S175000, C327S156000, C327S157000

Reexamination Certificate

active

07057465

ABSTRACT:
A high precision charge pump used in a phase-lock-loop incorporating a phase/frequency detector is designed and constructed to substantially eliminate the effects of DC offset and glitch errors on the charge pump output current. The high precision charge pump is constructed of parallel current paths each having a central node which is, in turn, connected to a feedback element. The feedback element defines a feedback current which is applied to the charge pump so as to maintain the two central nodes at an equi-potential level and to maintain the value of the pump-down current exactly equal to the value of the pump-up current output by the device.

REFERENCES:
patent: 5508660 (1996-04-01), Gersbach et al.
patent: 5942949 (1999-08-01), Wilson et al.
patent: 5945855 (1999-08-01), Momtaz
patent: 6181210 (2001-01-01), Wakayama
patent: 6326852 (2001-12-01), Wakayama
patent: 6373619 (2002-04-01), Sandstrom
patent: 6781425 (2004-08-01), Si
patent: 6897733 (2005-05-01), Wakayama

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