Current switching technique

Details Current switching technique Current switching technique

1981-04-16

1983-07-19

Atkinson, Charles E.

Excavating

307219, 307441, H02H 720

Patent

active

043947611

ABSTRACT:
A redundancy circuit comprising, in combination: a first measuring impedance; a plurality of operational amplifiers having inverting input terminals, non-inverting input terminals, and output terminals; a source of excitation voltage with respect to ground, the source being connected to the measuring impedance thus supplying signal current to the inverting input terminals, and the non-inverting input terminals being grounded; a like plurality of further impedances having first terminals connected respectively to the inverting terminals of the amplifier; and a switching arrangement having a plurality of conditions in each of which a selected one of the further impedances is connected between the output terminal and the inverting input terminal of a selected one of the amplifiers, and the remaining further impedances are connected between the inverting input terminals of the remaining amplifiers and ground.

REFERENCES:
patent: 3803425 (1974-04-01), Carp
patent: 3875390 (1975-04-01), Eccles et al.
patent: 4154395 (1979-05-01), Fancy
patent: 4199799 (1980-04-01), Ostenso et al.
patent: 4337638 (1982-07-01), Leonard et al.
patent: 4352159 (1982-09-01), Colby

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