High impedance common-emitter amplifier stage

Details High impedance common-emitter amplifier stage High impedance common-emitter amplifier stage

1994-12-29

1996-09-03

Nelms, David C.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Nonlinear amplifying circuit

327563, 327576, 327484, 327108, 327112, 330262, 330263, G06G 712, H03K 1760, H03K 300, H03K 318

Patent

active

055527418

ABSTRACT:
A high input impedance common-emitter amplifier stage is disclosed. This amplifier stage utilizes a transistor to buffer the base drive from the input stage of a Darlington circuit. This buffer action increases the input impedance of the common-emitter stage by a factor of beta (.beta.) of the buffering transistor. Various embodiments are disclosed.

REFERENCES:
patent: 3681619 (1972-08-01), Remy
patent: 3864641 (1975-02-01), Ahmed

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