Quasi-differential Mutual Capacitance Measurement

A circuit, system, and method for converting mutual capacitance to a digital value is described. Charge packets are transferred from a mutual capacitance to a pair of integration capacitors during alternate charge and discharge cycles. The time required to bring the discharged integration capacitor...

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Bibliographic Details
Main Author Bharathan Vibheesh
Format Patent
LanguageEnglish
Published 20.07.2017
Subjects
BASIC ELECTRONIC CIRCUITRY
CALCULATING
COMPUTING
COUNTING
ELECTRIC DIGITAL DATA PROCESSING
ELECTRICITY
MEASURING
MEASURING ELECTRIC VARIABLES
MEASURING MAGNETIC VARIABLES
PHYSICS
PULSE TECHNIQUE
TESTING
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Summary:A circuit, system, and method for converting mutual capacitance to a digital value is described. Charge packets are transferred from a mutual capacitance to a pair of integration capacitors during alternate charge and discharge cycles. The time required to bring the discharged integration capacitor to the same potential as the charged integration capacitor with a current source is measured as a single-slope analog-to-digital converter (ADC). The output of the ADC is representative of the mutual capacitance.
Bibliography:Application Number: US201715405047