Invention Grant
- Patent Title: Self capacitance drive offset cancellation in touch controller integrated circuits
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Application No.: US15947547Application Date: 2018-04-06
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Publication No.: US10581431B2Publication Date: 2020-03-03
- Inventor: James Hendrie Mcintyre , Sameer Wadhwa
- Applicant: QUALCOMM Incorporated
- Applicant Address: US CA San Diego
- Assignee: QUALCOMM Incorporated
- Current Assignee: QUALCOMM Incorporated
- Current Assignee Address: US CA San Diego
- Agency: Loza & Loza, LLP/Qualcomm
- Main IPC: H03K17/96
- IPC: H03K17/96 ; G06F3/041 ; G06F3/044
Abstract:
An interface circuit includes an amplifier having a first input, a second input, and an output, a drive capacitor coupled to the first input of the amplifier, and a feedback path coupled between the output of the amplifier and the second input of the amplifier. The interface circuit also includes a current driver coupled to the first input of the amplifier and the second input of the amplifier, wherein the current driver is configured to drive the drive capacitor with a first current, and to drive a touch panel capacitor coupled to the second input of the amplifier with a second current.
Public/Granted literature
- US20190310725A1 SELF CAPACITANCE DRIVE OFFSET CANCELLATION IN TOUCH CONTROLLER INTEGRATED CIRCUITS Public/Granted day:2019-10-10
Information query
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