Device with common mode feedback for a differential output

Details Device with common mode feedback for a differential output Device with common mode feedback for a differential output

1998-11-02

2000-09-12

Pascal, Robert

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330253, H03F 345

Patent

active

061183415

ABSTRACT:
A functional circuit such as an OP-amp has a differential output. A common mode signal at the differential output is adjusted by means of a common mode feedback circuit coupled between the differential output and the common mode adjustment input. The common mode feedback circuit contains IGFETs, each having a channel and a backgate, each connection of the differential output being coupled to the backgate of a respective one of the IGFETS. Thus the voltages at the outputs influence the current through the channel. The sum of the currents determines a feedback to the common mode control input.

REFERENCES:
patent: 5578964 (1996-11-01), Kim et al.
patent: 5604464 (1997-02-01), Hwang et al.
patent: 5729178 (1998-03-01), Park et al.

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