Highly linear low voltage rail-to-rail input/output...

Details Highly linear low voltage rail-to-rail input/output... Highly linear low voltage rail-to-rail input/output...

2003-03-07

2004-09-28

Choe, Henry (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S253000

Reexamination Certificate

active

06798292

ABSTRACT:

FIELD OF THE INVENTION
This invention generally relates to electronic systems and in particular it relates to operational amplifiers.
SUMMARY OF THE INVENTION
An operational amplifier circuit includes: a first differential pair of a first conductivity type having a first current branch and a second current branch; a second differential pair of a second conductivity type having a first current branch and a second current branch; a first current mirroring device coupled between the first branch of the first differential pair and the second branch of the second differential pair for combining the currents from these two branches; and a second current mirroring device coupled between the first branch of the second differential pair and the second branch of the first differential pair for combining the currents from these two branches.


REFERENCES:
patent: 5650753 (1997-07-01), Ling
patent: 6586995 (2003-07-01), Tachibana
patent: 6614302 (2003-09-01), Abe

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