Operational amplifier

Details Operational amplifier Operational amplifier

1992-01-21

1993-01-12

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330259, H03F 345, H03F 316

Patent

active

051793547

ABSTRACT:
A fully differential operational amplifier has a high DC gain and a high common mode feedback gain and produces an output voltage with rise and fall times shortened to the same extent. The operational amplifier comprises a first stage composed of MOS transistors M21 through M9, a drive stage composed of MOS transistors M10 through M17, and a phase-compensating circuit composed of MOS transistors M18, M19 and capacitive elements C1, C2. The drive stage is of a push-pull configuration of the MOS transistors M10 through M15 and the MOS transistors M16, M17. The above circuit arrangement increases the DC gain and the common mode feedback gain and shortens the rise and fall times of the output voltage to the same extent.

REFERENCES:
patent: 4554515 (1985-11-01), Burson et al.
patent: 4749955 (1988-06-01), Cook
patent: 4794349 (1988-12-01), Senderowicz
patent: 4963834 (1990-10-01), Yukawa

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