Capacitive touch sensor control unit with sampling capacitors for differential integration

In one embodiment, an apparatus comprises a pulse driver configured to generate an electrical pulse for transmission to a capacitive touch sensor. The apparatus further comprises a timing circuit configured to hold a first switch closed and a second switch open during a first edge of the electrical...

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Bibliographic Details
Main Authors SAETHER TERJE, SINGH TAJESHWAR, PEDERSEN TROND
Format Patent
LanguageEnglish
Published 15.03.2016
Subjects
BASIC ELECTRONIC CIRCUITRY
CALCULATING
COMPUTING
COUNTING
ELECTRIC DIGITAL DATA PROCESSING
ELECTRICITY
PHYSICS
PULSE TECHNIQUE
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Summary:In one embodiment, an apparatus comprises a pulse driver configured to generate an electrical pulse for transmission to a capacitive touch sensor. The apparatus further comprises a timing circuit configured to hold a first switch closed and a second switch open during a first edge of the electrical pulse, and hold the second switch closed and the first switch open during of a second edge of the electrical pulse. The apparatus further comprises a first capacitor configured to receive a first amount of charge that is indicative of a capacitance of an area of the capacitive touch sensor and a second capacitor configured to discharge a second amount of charge that is indicative of the capacitance of the area of the capacitive touch sensor. The apparatus further comprises a differential output configured to provide a measure of the voltage difference between the first capacitor and second capacitor.
Bibliography:Application Number: US201113207108