Amplifier using a follower transistor

Details Amplifier using a follower transistor Amplifier using a follower transistor

1993-01-29

1994-09-20

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including particular biasing arrangement

330288, H03F 304

Patent

active

053493087

ABSTRACT:
The disclosure relates to amplifiers using emitter follower type transistors and, more particularly, to means for the biasing of these emitter followers. The amplifier includes a follower transistor, a biasing circuit injecting a base biasing current into the base of the follower transistor, a current generator connecting the emitter of the follower transistor to a supply potential. According to one characteristic, the biasing circuit includes, firstly, a transistor called an image transistor, the emitter of which is connected to the emitter of the follower transistor and, secondly, a current injector for the injection, into the base of the follower transistor, of a current constituting a replica of the base current of the image transistor. One of the advantages of this arrangement is that it can be used to obtain the biasing circuit with transistors that are all of a same type, NPN or PNP, as the follower transistor.

REFERENCES:
patent: 3714600 (1973-01-01), Kuijk et al.
patent: 4575685 (1986-03-01), Dobkin et al.

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