Differential amplifying circuit having emitter follower circuit

Details Differential amplifying circuit having emitter follower circuit Differential amplifying circuit having emitter follower circuit

1991-07-17

1992-10-27

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330261, H03F 345

Patent

active

051592851

ABSTRACT:
A differential amplifying circuit includes two transistors, which are connected at collectors respectively to first terminals of two load resistors and at emitters respectively to a constant current source. An emitter follower transistor is commonly connected at a collector to second terminals of the two resistors and to a positive terminal of a direct current power supply, and at an emitter to a base of one of the two transistors. An input signal is supplied to the base of the emitter follower transistor and then supplied to the base of the transistor which is connected therewith. A differential output is picked up at the collectors of the two transistors. In this circuit, the emitter follower transistor is biased by the constant current source which also biases the two transistors of the differential amplifying circuit.

REFERENCES:
patent: 3790897 (1974-02-01), Wheatley, Jr.
patent: 4105942 (1978-08-01), Henry

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