Invention Grant
- Patent Title: Amplified charge cancellation in a touch sensor, and related systems, methods, and devices
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Application No.: US17301744Application Date: 2021-04-13
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Publication No.: US11604539B2Publication Date: 2023-03-14
- Inventor: Torbjoern Loevseth Finnoey , Lei Zou
- Applicant: Microchip Technology Incorporated
- Applicant Address: US AZ Chandler
- Assignee: Microchip Technology Incorporated
- Current Assignee: Microchip Technology Incorporated
- Current Assignee Address: US AZ Chandler
- Agency: TraskBritt
- Main IPC: G06F3/041
- IPC: G06F3/041 ; G06F3/044

Abstract:
A charge compensation circuit is disclosed that provides amplified charge cancellation. A touch controller is disclosed that includes such a charge compensation circuit and may realize improved immunity to baseline capacitance signals that are much larger than a change in capacitance due to proximity of an object. Such a charge compensation circuit may include a capacitor, a driver circuit arranged to apply a pulsed voltage signal to the capacitor, and a current conveyor having a programmable gain and arranged to amplify an initial charge generated by the capacitor in response to the pulsed voltage signal and provide an amplified charge to an output of the charge cancellation circuit.
Public/Granted literature
- US20210333924A1 AMPLIFIED CHARGE CANCELLATION IN TOUCH SENSOR, AND RELATED SYSTEMS METHODS AND DEVICES Public/Granted day:2021-10-28
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