Amplifier with a gain proportional to power source voltage

Details Amplifier with a gain proportional to power source voltage Amplifier with a gain proportional to power source voltage

2005-12-06

2005-12-06

Mottola, Steven J. (Department: 2817)

Amplifiers

Signal feedback

Variable impedance in feedback path varied by separate...

C330S174000, C073S504160

Reexamination Certificate

active

06972619

ABSTRACT:
In order that an amplifier with a gain proportional to source voltage is obtained, the drain-source voltages of first and second P-channel MOS-FETs are zero-biased, and a voltage shifted higher by the amount of the threshold voltage of the P-channel MOS-FET on the basis of a voltage obtained by dividing the power source voltage by resistors is applied to the positive input terminal of an operational amplifier. The gate of one of the first and second MOS-FETs is connected to a circuit ground, and a negative fixed voltage with reference to the potential obtained by dividing the power source voltage by resistors is applied to the gate of the other MOS-FET. The ON resistances of the two MOS-FETs are used as the input resistor and the feedback resistor of the operational amplifier, respectively.

REFERENCES:
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patent: 5239868 (1993-08-01), Takenaka et al.
patent: 5447066 (1995-09-01), Terada et al.
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patent: 6412347 (2002-07-01), Kuroda et al.
patent: HEI 3-103768 (1991-04-01), None
patent: HEI 6-208424 (1994-07-01), None

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