Differential amplifier

Details Differential amplifier Differential amplifier

1974-09-11

1976-03-30

Rolinec, R. V.

Amplifiers

Signal feedback

Combined with control of bias voltage of signal amplifier

307279, 330 22, 330 35, H03F 368

Patent

active

039477789

ABSTRACT:
A family of differential amplifiers are described which utilize only MOSFET transistors as the active devices. These amplifiers exhibit an infinite input impedance and zero input offset and bias currents. The circuits are capable of operating over a wide range of DC supply voltages at extremely low DC current drain. A differential amplifier is shown which operates from a single positive DC supply voltage and which handles a wide range of input common mode voltage swings including some negative common mode voltages. Another amplifier is shown which operates from a combination of a single positive and a single negative supply voltage and which handles a wide range of positive and negative input common mode voltage swings.

REFERENCES:
patent: 3569849 (1971-03-01), Cassidy
patent: 3581226 (1971-05-01), Perkins
patent: 3660773 (1972-05-01), Free
patent: 3667063 (1972-05-01), Boyd et al.
patent: 3852679 (1974-12-01), Schade, Jr.

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