High gain, programmable differential amplifier circuitry

Details High gain, programmable differential amplifier circuitry High gain, programmable differential amplifier circuitry

1988-01-18

1989-04-25

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330254, 330258, H03F 345

Patent

active

048251739

ABSTRACT:
An amplifier includes a first differential pair of transistors with commonly connected input electrodes also connected to a variable current sink. A common mode voltage control circuit includes a second differential pair of transistors, one of which has a control electrode coupled to the output electrodes of the first differential pair. The second differential pair provides control signals to the variable current sink to regulate the common mode output voltage. Current control circuitry is coupled to the variable current sink to allow adjustment of the gain, bandwith or power dissipation of the first differential pair.

REFERENCES:
patent: 4272728 (1981-06-01), Wittlinger
patent: 4288754 (1981-09-01), Okada et al.

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