High-speed low-noise charge pump

Details High-speed low-noise charge pump High-speed low-noise charge pump

2006-02-28

2006-02-28

Callahan, Timothy P. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

C327S157000, C331S016000

Reexamination Certificate

active

07005896

ABSTRACT:
A high-speed, low-noise charge pump for use in a phase-locked loop. The charge pump is constituted by first and second cascode current mirrors, as well as first and second switching transistors. The first cascode current mirror includes a first output mirror transistor and a first output cascode transistor. The first switching transistor is interposed between the first output mirror and the first output cascode transistors. During assertion of a first control signal, the first switching transistor is turned on so a first mirror current can flow through an output node. Likewise, the second cascode current mirror includes a second output mirror transistor and a second output cascode transistor. The second switching transistor is interposed between the second output mirror and the second output cascode transistors. During assertion of a second control signal, the second switching transistor is turned on so the second mirror current can flow through the output node.

REFERENCES:
patent: 5952884 (1999-09-01), Ide
patent: 6043716 (2000-03-01), Warner
patent: 6052015 (2000-04-01), Desbonnets
patent: 6160432 (2000-12-01), Rhee et al.
patent: 6169456 (2001-01-01), Pauls
patent: 6392494 (2002-05-01), Takeyabu et al.
patent: 6586976 (2003-07-01), Yang
patent: 6677789 (2004-01-01), Svärd

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