CMOS rail-to-rail input/output amplifier

Details CMOS rail-to-rail input/output amplifier CMOS rail-to-rail input/output amplifier

1997-04-15

1999-07-27

Pascal, Robert

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330261, H03F 345

Patent

active

059297050

ABSTRACT:
A CMOS rail-to-rail input/output operational amplifier has constant supply current with respect to the input signal's common mode voltage. By use of current bleeders, i.e. a smaller transistor of opposite conductivity type connected in parallel with each transistor in the differential pair of transistors, there is provided constant transconductance and constant supply current for rail-to-rail operation with respect to the positive and negative supply voltages. This allows production of a low cost, high performance and small area rail-to-rail input/output operational amplifier.

REFERENCES:
patent: 4797631 (1989-01-01), Hsu et al.
patent: 5293136 (1994-03-01), Ryat
patent: 5491455 (1996-02-01), Kuo
patent: 5550510 (1996-08-01), Nagaraj

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