PNP Current mirror

Details PNP Current mirror PNP Current mirror

1977-10-31

1978-07-25

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including current mirror amplifier

307297, 323 4, 330289, H03F 318

Patent

active

041032497

ABSTRACT:
A controlled current source circuit using PNP mirror transistors and having wide frequency bandwidth as well as correction for D.C. offset, said circuit comprised of first and second PNP transistors, one of which is connected as a diode, the base terminals of which are commonly connected, the collector terminals of each of which are connected respectively to first and second terminals of a current bias means providing control of emitter-base characteristics and correction for offset caused by base currents, the emitter terminals of which are each connected respectively to first and second resistors, the resistors connected to common potential source, wherein mirror currents are tapped from the connections between the emitter terminals and the resistors and wherein the output mirror current is the collector current of an NPN transistor, the base and collector terminals of which are respectively connected to the collector and emitter terminals of the second PNP transistor.

REFERENCES:
patent: 3909628 (1975-09-01), Muto

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