Capacitance measuring circuit

Details Capacitance measuring circuit Capacitance measuring circuit

2006-05-24

2011-11-08

Natalini, Jeff (Department: 2858)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

C324S519000, C341S143000

Reexamination Certificate

active

08054089

ABSTRACT:
The present invention is based on the finding that a capacitance can be measured precisely and efficiently when, in a delta-sigma modulator having an operational amplifier, a first capacitor connectable to an input of the operational amplifier, and a second capacitor in a feedback branch of the operational amplifier, a reference signal source is connectable to the first capacitor, wherein the first or second capacitor may represent a capacitance to be measured. Due to the fact that, in contrast to what is conventional, no input quantity is measured and digitalized at the input of the delta-sigma modulator, but instead a defined reference signal source is coupled at the input and a device of the delta-sigma modulator itself represents the measuring quantity, an extremely compact circuit is provided allowing capacitances to be measured quickly and reliably, the measuring result being additionally made available in a digital form.

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English translation of the official communication issued in counterpart International Application No. PCT/EP2006/004989, mailed on May 15, 2008.
Official communication issued in the International Application No. PCT/EP2006/004989, mailed on Aug. 14, 2006.
Official communication issued in the counterpart International Application No. PCT/EP2006/004989, mailed on Aug. 14, 2006.

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