Systems and methods for measuring picoampere current levels

Details Systems and methods for measuring picoampere current levels Systems and methods for measuring picoampere current levels

2006-02-14

2006-02-14

Lee, Diane I. (Department: 2858)

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

For fault location

C324S076170, C702S064000

Reexamination Certificate

active

06998850

ABSTRACT:
In one embodiment, a circuit measures picoampere current levels. The circuit comprises: an operational-amplifier that has differential inputs and differential outputs; a switching structure that switchably couples an input line to one of the differential inputs in response signals from a timing circuit; a first integrating capacitor coupled to one of the differential inputs and to one of the differential outputs; a second integrating capacitor coupled to the other of the differential inputs; and a charge injection compensation structure that selectively injects charge into the input line and removes charge from the input line in response to signals from the timing circuit.

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