Linear charge pump for fractional synthesis using an...

Details Linear charge pump for fractional synthesis using an... Linear charge pump for fractional synthesis using an...

2004-05-17

2008-12-30

Tra, Quan (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

Reexamination Certificate

active

07471127

ABSTRACT:
A charge pump in a PLL incorporates interlinked first and second charge pumps that inject or withdraw a charge from a loop filter. The charge is proportional to a phase difference between a VCO and reference clock in the PLL.

REFERENCES:
patent: 5886551 (1999-03-01), Narahara
patent: 6771729 (2004-08-01), Takahashi et al.
patent: 6826248 (2004-11-01), Kushibe
patent: 2003/0107419 (2003-06-01), Park

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