High gain rail-to-rail CMOS amplifier

Details High gain rail-to-rail CMOS amplifier High gain rail-to-rail CMOS amplifier

1993-02-25

1994-08-09

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330257, 330285, 330264, H03F 345

Patent

active

053370082

ABSTRACT:
A CMOS operational amplifier input senses a rail-to-rail differential voltage and provides an amplifier rail-to-rail single-ended output voltage. A first P-channel input section sources a first differential signal current that is proportional to a first portion of the input voltage, and a second N-channel input section sinks a second differential signal current that is proportional to a second portion of the input voltage. The first and second differential currents are combined in a folded cascode gain stage to produce an intermediate single-ended voltage that is not rail-to-rail. The single-ended intermediate voltage is converted to a rail-to-rail output voltage in a current-limited rail-to-rail output section.

REFERENCES:
patent: 4554515 (1985-11-01), Burson et al.
patent: 4958133 (1990-09-01), Bazes

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