One terminal capacitor interface circuit

Details One terminal capacitor interface circuit One terminal capacitor interface circuit

2007-06-26

2007-06-26

Hirshfeld, Andrew H. (Department: 2858)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

C324S679000, C341S143000

Reexamination Certificate

active

11370764

ABSTRACT:
A one terminal capacitor interface circuit for sensing the capacitance of a capacitor includes a differential integrating amplifier having an input common mode voltage and two summing nodes whose voltage is substantially equal to the input common mode voltage, a switching circuit for charging the capacitor to a first voltage level in a first phase, connecting, in a second phase, the capacitor to one of the summing nodes of the differential amplifier to provide a first output change substantially representative of the difference between the first voltage level and the input common mode voltage, and also representative of the capacitor; charging the capacitor to a second voltage level in a third phase, and connecting, in a fourth phase, the capacitor to the other summing node of the differential amplifier to provide a second output change substantially representative of the difference between the second voltage level and the input common mode voltage, and also representative of the capacitor; the combined first and second output changes representing the capacitance of the capacitor substantially independent of the input common mode voltage.

REFERENCES:
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patent: 6970126 (2005-11-01), O'Dowd et al.
patent: 7010440 (2006-03-01), Lillis et al.

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