PARASITIC CAPACITANCE CANCELLATION IN CAPACITIVE MEASUREMENT
First Claim
1. An integrated circuit for measuring capacitance of a capacitive structure using a charge transfer technique, said circuit comprising means for transferring charge during each of a plurality of cycles during a capacitive measurement to a reference capacitor wherein the charge transferred from the measured capacitive structure and accumulated in the reference capacitor during every cycle in the capacitive measurement is reduced by a predetermined amount of charge.
3 Assignments
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Accused Products
Abstract
An integrated circuit compensates for parasitic capacitance in a capacitive measuring apparatus wherein a capacitance measurement is done by repeatedly transferring charge from a capacitor to be measured to a reference capacitor.
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Citations
5 Claims
- 1. An integrated circuit for measuring capacitance of a capacitive structure using a charge transfer technique, said circuit comprising means for transferring charge during each of a plurality of cycles during a capacitive measurement to a reference capacitor wherein the charge transferred from the measured capacitive structure and accumulated in the reference capacitor during every cycle in the capacitive measurement is reduced by a predetermined amount of charge.
Specification