Charge pump with reduced turn-off time and phase locked loop...

Details Charge pump with reduced turn-off time and phase locked loop... Charge pump with reduced turn-off time and phase locked loop...

2007-01-04

2009-12-29

Shingleton, Michael B (Department: 2815)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

C331S17700V, C327S157000, C327S148000, C327S112000, C327S391000

Reexamination Certificate

active

07639089

ABSTRACT:
A charge pump includes a current source/sink unit that charges/discharges an output node in response to an UP/DOWN signal generated by a PFD (phase frequency detector). The charge pump also includes a pull-down/pull-up unit configured to discharge/charge a cascode node within the current source/sink unit for a limited time period after the UP/DOWN signal reaches a threshold level during transition of the UP/DOWN signal for turning off the current source/sink unit.

REFERENCES:
patent: 6420914 (2002-07-01), Hasegawa
patent: 6919746 (2005-07-01), Suzuki
patent: 2005/0156673 (2005-07-01), Pretl et al.
Korean Patent Application No. 1020010086667 to Jun et al., having Publication date of Jul. 4, 2003 (w/ English Abstract page).
Japanese Patent Application No. 2002-376520 to Masahito, having Publication date of Jul. 22, 2004 (w/ English Abstract page).

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