Biasing of transistor amplifier cascades

Details Biasing of transistor amplifier cascades Biasing of transistor amplifier cascades

1980-04-24

1982-06-08

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including particular biasing arrangement

330288, 323315, H03F 304

Patent

active

043341985

ABSTRACT:
A common-collector-amplifier transistor is followed in direct-coupled cascade connection by a common-emitter amplifier transistor. A multiple-V.sub.BE supply biases the base of the common-collector-amplifier transistor respective to the emitter of the common-emitter amplifier, so the quiescent collector current of the common-emitter-amplifier transistor can be accurately defined. To improve the high-frequency response of the common-collector amplifier transistor, while preserving the capability of accurately defining the quiescent collector current of the common-emitter-amplifier transistor, the emitter of the common-collector amplifier transistor is supplied bias current from the collector of a constant-current-generator transistor having its emitter-to-base voltage related to that of one of the transistors in the multiple-V.sub.BE supply.

REFERENCES:
patent: 3364434 (1968-01-01), Widlar
patent: 3531730 (1970-09-01), Steckler
patent: 3534279 (1970-10-01), Limberg
patent: 3835410 (1974-09-01), Wittlinger
patent: 3868581 (1975-02-01), Ahmed
patent: 3906386 (1975-09-01), Hongu et al.

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