Reduced charge injection in current switch

Details Reduced charge injection in current switch Reduced charge injection in current switch

2005-01-11

2005-01-11

Callahan, Timothy P. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

C327S389000

Reexamination Certificate

active

06842053

ABSTRACT:
A current switching circuit has greatly reduced charge injection effects with the introduction of a mirror path to mirror the switch path. The mirror path comprises a complementary switch and a pulling amplifier, e.g., a pull-down amplifier for a source current switching circuit, or a pull-up amplifier for a sink current switch circuit. The pulling amplifier mirrors the status of an output path of a current source, e.g., a transistor current source, such that when the current source is switched ON or OFF, the switching process with respect to the load, e.g., a load capacitor, is smooth and provides a clean current waveform due to greatly reduced charge injection.

REFERENCES:
patent: 5343196 (1994-08-01), Harston
patent: 5548288 (1996-08-01), Lueng
patent: 5635935 (1997-06-01), Ignowski et al.
patent: 6005433 (1999-12-01), Hale
patent: 6137275 (2000-10-01), Ravon

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