Method and system of optimizing a control system using low...

Details Method and system of optimizing a control system using low... Method and system of optimizing a control system using low...

2011-05-17

2011-05-17

Donovan, Lincoln (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S148000

Reexamination Certificate

active

07944257

ABSTRACT:
A phase-locked loop charge pump driven by low voltage input is disclosed. In one aspect, a charge pump for a phase-locked loop circuit includes a sourcing current source providing a sourcing current, wherein the sourcing current source is coupled to a high-voltage operating voltage supply. A sourcing control circuit uses low-voltage sourcing control signals to selectively cause the charge pump to source the sourcing current to an output of the charge pump. A sinking control circuit uses low-voltage sinking control signals at a low voltage and utilizes a low-swing current mechanism to sink the sinking current from the output of the charge pump. In another aspect, the sourcing control circuit is cascode and the sinking circuit is non-cascode. In another aspect the sourcing current source and the sinking current source are both cascode. In another aspect, the sourcing current source is non-cascode and the sinking current source is cascode. In another aspect, the sourcing current source and the sinking current source are both non-cascode.

REFERENCES:
patent: 6292061 (2001-09-01), Qu
patent: 6441655 (2002-08-01), Fallahi et al.
patent: 7005896 (2006-02-01), Chen et al.
patent: 7132880 (2006-11-01), Ingino, Jr.
patent: 7705641 (2010-04-01), Wu et al.

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