Differential amplifiers

Details Differential amplifiers Differential amplifiers

1978-08-25

1980-10-21

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330253, 330255, 330261, H03F 345, H03F 304

Patent

active

042297052

ABSTRACT:
A differential amplifier able to produce differential-mode output signals different from one another in DC voltage level, is formed by connecting a pair of NPN transistors and another pair of PNP transistors so that the emitter electrodes of these four transistors are coupled to one another by a resistive coupling circuit. The resistive coupling circuit is so arranged that the resistance between the emitter electrodes of the NPN transistors is equal to that between the emitter electrodes of the PNP transistors, with the resistances between the emitter electrodes of one of the NPN transistors and of one of the PNP transistors being equal to that between the emitter electrodes of the other NPN transistor and the other PNP transistor. When one of two input signals is applied to the base electrodes of one of the NPN transistors and of one of the PNP transistors, with the other of the input signals applied to the base electrodes of the other NPN and PNP transistors, differential-mode output signals are obtained at the collector electrodes of the NPN transistors and differential-mode output signals of a different DC voltage level are obtained at the collector electrodes of the PNP transistors.

REFERENCES:
patent: 3497824 (1970-02-01), Goordman
patent: 3927333 (1975-12-01), Furuhashi
patent: 4015290 (1977-03-01), Bowers

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