Differential amplifier with improved voltage gain

Details Differential amplifier with improved voltage gain Differential amplifier with improved voltage gain

1996-08-30

1998-09-22

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330311, H03F 345

Patent

active

058120262

ABSTRACT:
A circuit used with a differential amplifier to eliminate the effect of Early Voltage from voltage gain provided by the differential amplifier. With a differential amplifier utilizing PNP transistors which experience the lowest, and most undesirable Early Voltage, the circuitry includes a pair of transistors 400 and 402, each with a base connected to an input of the differential amplifier corresponding to a similar base connection of a respective one of transistors 100 and 102 of the differential amplifier, an emitter connected to a current source, and a collector connected to the collector of a respective one of NPN current sink transistors 306 and 308 connected at outputs of the differential amplifier. The circuitry for elimination of Early Voltage further includes components to assure the collector voltages of transistors 400 and 402 are equal and the collector voltages of transistors 102 and 400 are equal. In addition to circuitry for elimination of Early Voltage when PNP transistors 100 and 102 are used to provide the differential amplifier inputs, the circuitry may also be configured for use when NPN transistors provide inputs for a differential amplifier.

REFERENCES:
patent: 4626795 (1986-12-01), Tanaka et al.
patent: 5144169 (1992-09-01), Hirabayashi et al.
patent: 5168243 (1992-12-01), Feliz et al.

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