Differential amplifier with constant gain

Details Differential amplifier with constant gain Differential amplifier with constant gain

1975-11-12

1976-07-20

Rolinec, R. V.

Amplifiers

Signal feedback

Combined with control of bias voltage of signal amplifier

307304, 330 22, 330 35, H03F 316

Patent

active

039709515

ABSTRACT:
The subject of this invention is a differential amplifier circuit having a constant gain characteristic over a range of input voltage and suitable for use in integrated circuits in semi-conductor chips. The circuit is embodied in the enhanced-depleted field effect transistor technology and includes a pair of parallel circuits. Each circuit has a depletion type of field effect transistor (FET) connected to the drain voltage source, and its source connected to the drains of two enhanced FET's and to the gate of the one of these which has its source to a ground level. The other enhanced FET's have their sources connected together and to a constant current source. One gate of these other FET's is connected to the reference voltage and the other to an input voltage to be amplified. By a proper selection of FET design parameters, the amplifier gain can be constant over the full operating range of the input voltage.

REFERENCES:
patent: 3700981 (1972-10-01), Masuhara et al.
patent: 3832644 (1974-08-01), Nagata et al.

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