Current amplifier circuit

Details Current amplifier circuit Current amplifier circuit

1990-02-07

1991-02-05

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including current mirror amplifier

330289, 323315, H03F 304

Patent

active

049908642

ABSTRACT:
An amplifier circuit (10) is provided which comprises a first transistor (12) and a second transistor (14). A current buffer circuit (16) is coupled to the basis of the transistors (12, 14) to provide base drive current. A voltage proportional to absolute temperature, V.sub.PTAT, is applied between the emitters of the transistors (12,14). An input current is received by the transistor (12) and an output current is generated by the transistor (14). The output current I.sub.out is amplified with respect to the input current I.sub.in by a gain factor which is substantially independent of temperature considerations. Circuitry is provided for altering the value of the voltage proportional to the absolute temperature, V.sub.PTAT, such that the gain of the amplifier circuit (10) is programmable.

REFERENCES:
patent: 4055811 (1977-10-01), Wheatley, Jr.
patent: 4614916 (1986-09-01), Rinderle
patent: 4677368 (1987-06-01), Bynum
patent: 4814724 (1989-03-01), Tanigawa
Radovsky, "Current-Mirror Amplifiers Having Current Gains Less Influenced by the Base Currents of Component Transistors," RCA Technical Notes, TN No. 949, Dec. 1973.

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