CMOS differential amplifier having offset voltage cancellation a

Details CMOS differential amplifier having offset voltage cancellation a CMOS differential amplifier having offset voltage cancellation a

1998-09-25

2000-05-16

Mottola, Steven J.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330258, H03F 345

Patent

active

060642629

ABSTRACT:
A differential amplifier for amplifying the difference between first and second input signals and producing therefrom a differential output signal. The differential amplifier includes first and second transistors connected to a common DC current source and receiving, at the transistor gate terminals, the respective first and second input signals. Each transistor has a common mode voltage associated therewith. A voltage control circuit generates control signals that are applied to the backgate terminals of the transistors to calibrate the differential output voltage and to adjust the common mode voltages of the transistors.

REFERENCES:
patent: 5436594 (1995-07-01), Pace et al.
patent: 5463347 (1995-10-01), Jones et al.
patent: 5789980 (1998-08-01), Nagata et al.
patent: 5939904 (1999-08-01), Fetterman et al.

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