Operational amplifier for stably driving a low impedance load of

Details Operational amplifier for stably driving a low impedance load of Operational amplifier for stably driving a low impedance load of

1992-09-15

1994-02-08

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330255, H03F 345

Patent

active

052851680

ABSTRACT:
An operational amplifier is equipped at its input stage with a folded cascode type differential amplifier and at its downstream stage with pre-buffers, which include a differential amplification stage of PMOS input and a differential amplification stage of NMOS input, as level shifters. A MOS resistor having its gate terminal fed with an intermediate bias potential between a supply voltage V.sub.DD and an earth potential is connected between every one of the drain terminals of current-mirror connected load MOSFETs in the pre-buffers. As a result, the gains of the pre-buffers in the steady state can be suppressed to about 10 dB or less. The individual MOSFETs of the push-pull output stage are individually driven by the pre-buffers of low gains.

REFERENCES:
patent: 4459555 (1984-07-01), Jett
patent: 5034700 (1991-07-01), Herrmann et al.

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