Differential clamp for amplifier circuits

Details Differential clamp for amplifier circuits Differential clamp for amplifier circuits

1998-06-01

1999-10-26

Pascal, Robert

Amplifiers

With semiconductor amplifying device

Including differential amplifier

327309, H03F 345, H03K 508

Patent

active

059735619

ABSTRACT:
The frequency response of a differential amplifier or comparator is improved by adding a positive and negative clamp at the collector (drain in the case of an MOS embodiment) outputs of the differential transistor pair that will clamp the output voltage swing to less than one RC time constant. The frequency response (rise time t.sub.r) is improved from t.sub.r =2.2.times.RC to t.sub.r <<1.times.RC. The differential output resistors can be increased to improve the differential gain while maintaining an improved rise time of t.sub.r <<1.times.RC.

REFERENCES:
patent: 4977378 (1990-12-01), Tero
patent: 5144171 (1992-09-01), Huard
patent: 5206550 (1993-04-01), Mehta

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