Signal conversion circuit

Details Signal conversion circuit Signal conversion circuit

1988-02-29

1989-09-19

Jennings, Derek S.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

307116, 340665, 340668, 341122, 341172, 73770, 7386253, H01H 3500

Patent

active

048684112

ABSTRACT:
A signal conversion circuit converts variations in resistance into an electrical signal. The conversion circuit comprises both a bridge circuit and a single operational amplifier with a capacitor between them to store voltage samples produced by an unbalancing of the bridge. The bridge circuit has a detector element such as a strain gauge for providing a resistance variation. A capacitor is connected through switches to both the bridge circuit and signal operational amplifier. The switches operate in a sequence whereby the operational amplifier is disconnected from the capacitor during the storage of the sample and the bridge is disconnected from the capacitor during intervals while the charged capacitor is connected to the amplifer.

REFERENCES:
patent: 3421093 (1969-01-01), Hinrichs et al.
patent: 3573816 (1971-04-01), Helgeland
patent: 3744047 (1973-07-01), Allen
patent: 4217543 (1980-08-01), Strong
patent: 4404545 (1983-09-01), Nakanishi et al.
patent: 4578646 (1986-03-01), Maio et al.
Zeroing Loop Reduces Instrumentation Amplifier Offsets by Cerat, EDN Magazine, Mar. 20, 1976, pp. 100 and 102.
Instrumentation Amplifiers by R. Duris, EDN Magazine, Sep. 5, 1977, pp. 133-135.

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