Temperature compensating pressure sensor amplifier circuits

Details Temperature compensating pressure sensor amplifier circuits Temperature compensating pressure sensor amplifier circuits

1980-04-14

1982-04-20

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330289, 328 3, H03F 345

Patent

active

043261710

ABSTRACT:
An amplifier circuit is disclosed for temperature compensating the output voltage thereof with respect to undesirable temperature induced signals from a silicon pressure transducer and/or from components of the amplifier itself. The amplifier includes a first operational amplifier and a second operational amplifier. A first circuit connects the output terminal of the first operational amplifier through a summing node to one input terminal of the second amplifier. Output signals from the pressure transducer are applied between one input terminal of the first operational amplifier and another input terminal of the second amplifier. A temperature compensating circuit is connected to the summing node for enabling the output voltage of the amplifier to be substantially independent of temperature. An initial offset voltage compensating circuit is coupled to the summing node for adjusting the intercept of the pressure-to-output voltage transfer curve. The gain of the second operational amplifier determines the slope of the curve.

REFERENCES:
patent: 3967188 (1976-06-01), Spencer
Katsuhiko Kawashima, "A New Temperature Compensating Method for Logarithmic Amplifier" IEEE Transactions, Nuclear Science, vol. 17 No. 5, Oct. 1970.

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