Guard circuit for high impedance signal circuits

Details Guard circuit for high impedance signal circuits Guard circuit for high impedance signal circuits

1976-11-11

1978-05-23

Miller, J D

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

307200A, 307303, 330207P, H02H 720

Patent

active

040914305

ABSTRACT:
Current leakage from high impedance signal circuits or networks of the type useful in the feedback paths of operational amplifiers is inhibited or prevented by circuit guarding. A lower impedance, parallel path provides a guard circuit that protects the signal circuit elements from excessive self-generated current leaks during closed loop use of operational amplifiers. The guard circuit includes equal potential nodes in the lower impedance path that are juxtaposed to corresponding nodes of the signal circuit elements. Current leakages, that may occur in the signal path, are mostly intercepted by the lower impedance guard circuit preventing the formation of electric fields or current leakage paths that would affect normal signal circuit performance.

REFERENCES:
patent: 3980928 (1976-09-01), Newington et al.

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