Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Patent
1993-08-06
1995-10-24
Wieder, Kenneth A.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
324725, 324 98, 323365, G01R 1702
Patent
active
054613221
ABSTRACT:
A feedback operated DC bridge circuit for monitoring the voltage variations in a voltage divider circuit using a voltage controlled resistance component to reach a null balance across the bridge. Amplification is provided at higher accuracy near the null point when the voltage difference across the bridge is zero. The feedback bridge circuit includes an integrator which directly drives the controlling component to the value of the resistance in an unknown branch to force the null condition. The voltage controlled component (configured as a discrete metal oxide semiconductor device or bipolar junction transistor) and the balancing scheme are suitable for microfabrication and provides noise-rejection enhancement. The interconnected integral feedback of the autonulling DC bridge enables both a neural network for pre-processing sensor input in a spatial domain as well as general analog computation that mimics a first order differential equation in the form of the system state equation.
REFERENCES:
patent: 4015209 (1977-03-01), Meyer-Ebrecht
patent: 4795965 (1989-01-01), Dooley
patent: 5159277 (1992-10-01), Mount
patent: 5189362 (1993-02-01), Doble
patent: 5264798 (1993-11-01), Bey et al.
patent: 5309085 (1994-05-01), Sohn
Bey, Jr. Paul P.
Fare Thomas L.
Yonce David J.
Brown Glenn W.
Geo-Centers, Inc.
Naval Research Laboratory
Wieder Kenneth A.
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