Gain control circuit of current mirror circuit type

Details Gain control circuit of current mirror circuit type Gain control circuit of current mirror circuit type

1987-07-13

1989-03-21

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including current mirror amplifier

323315, 330278, H03F 304

Patent

active

048147249

ABSTRACT:
A gain control circuit of the current mirror circuit type in which a current source for a first current mirror circuit is constituted with the output stage of another current mirror circuit. Among the junctions of the first current mirror circuit and the another current mirror circuit, the bias side junction of the first current mirror circuit is used as an input terminal and the other as an output terminal. A predetermined current is supplied to a resistor connected to the emitter of the bias side transistor of the first current mirror circuit to obtain a predetermined gain. Application of a signal to the resistor, which signal is opposite in phase to an input signal, serves to cancel the influence of the input signal to thereby eliminate fluctuations in the gain.

REFERENCES:
Radovsky, "Universal Current Mirror", RCA Technical Notes, TN No. 1132, Oct. 28, 1975.

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