Current amplifier circuit

Details Current amplifier circuit Current amplifier circuit

1987-08-31

1989-02-14

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including current mirror amplifier

323315, H03F 304

Patent

active

048049271

ABSTRACT:
A current amplifier circuit has a first transistor with a collector and a base which are electrically connected, a second transistor connected in series with the first transistor and having a collector and a base which are electrically connected. A third and fourth transistor are connected in series with the collector of the first transistor connected to a base of the third transistor and the collector of the second transistor connected to a base of the fourth transistor through a resistor having a resistance R. The first, second, third and fourth transistors have the same polarity. An amplified output signal current R.multidot.i/R.sub.E is obtained from a collector of the third transistor, wherein R.sub.E is the emitter resistance of the fourth transistor and i is the input signal applied to the base of the fourth transistor.

REFERENCES:
patent: 3364434 (1968-01-01), Widlar
patent: 3835410 (1974-09-01), Wittlinger
patent: 3992676 (1976-11-01), Knight
patent: 4461989 (1984-07-01), Dotson et al.

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