Amplifier with input referred common-mode adjustment

Details Amplifier with input referred common-mode adjustment Amplifier with input referred common-mode adjustment

1997-08-04

1999-08-10

Pascal, Robert

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330253, H03F 345

Patent

active

059364696

ABSTRACT:
A circuit and method control the common-mode potential at an output (17, 18) of a fully differential amplifier (32) by feeding forward a common-mode correction signal through the amplifier. An input signal (V.sub.IN+ -V.sub.IN-) is amplified in the amplifier to produce a differential output signal (V.sub.O- -V.sub.O+) at the output. A common potential of the differential inputs (37, 38) of the amplifier is sensed with a transistor (54, 56) biased to a reference voltage (V.sub.CM) and amplified through the amplifier to produce a common-mode correction signal to offset a common-mode component of the differential output signal. A feedback circuit (33-36) is used to develop the common potential from the common-mode component.

REFERENCES:
patent: 4568885 (1986-02-01), McKenzie et al.
patent: 4573020 (1986-02-01), Whatley
patent: 5216380 (1993-06-01), Carbou
patent: 5319316 (1994-06-01), Fensch
patent: 5465072 (1995-11-01), Atarodi
patent: 5493246 (1996-02-01), Anderson
patent: 5631607 (1997-05-01), Huijsing et al.
patent: 5691664 (1997-11-01), Anderson et al.
patent: 5729178 (1998-03-01), Park et al.

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