Fully differential current-feedback CMOS/bipolar operational...

Details Fully differential current-feedback CMOS/bipolar operational... Fully differential current-feedback CMOS/bipolar operational...

2007-05-08

2007-05-08

Pascal, Robert (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S259000

Reexamination Certificate

active

10950201

ABSTRACT:
A fully differential current feedback amplifier suitable for using in a fully differential operational amplifier circuit is disclosed. Symmetrical low input impedance input circuits receive a differential input current and provide a set of four currents that correspond to the differential input currents. These current are input to a pair of subtraction circuits that output a first voltage signal responsive to the positive difference and a second voltage signal responsive to the negative difference. In some embodiments these signals may be further amplified. A common mode circuit is provided that averages the output voltage and feeds back current in response to the subtraction circuits. In this way the average common mode output DC voltage can be set to particular voltage levels.

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Data Sheet for Analog Device's 800 MHz, 50mW Current Feedback Amplifier—AD8001, 2003.

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