CMOS power operational amplifier

Details CMOS power operational amplifier CMOS power operational amplifier

1988-06-10

1989-05-09

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330257, 330260, 330311, H03F 345

Patent

active

048292664

ABSTRACT:
A CMOS power operational amplifier with large output voltage swing and high noise rejection is obtained by coupling a folded cascode type differential input stage and an output stage comprising an intermediate signal shifting amplifier and two common source output stages. Constant current generators inject into the drain of grounded gate MOS transistors pairs of said folded cascode type stage and of said intermediate signal shifting amplifier, respectively, a current which is pulled out of the source of the same grounded gate transistors by other constant current generators for increasing the effective transconductance of said grounded gate transistors pairs.

REFERENCES:
patent: 4538114 (1985-08-01), Kunimi et al.
patent: 4730168 (1988-03-01), Senderowicz et al.

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