Invention Grant
- Patent Title: Front-end signal compensation
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Application No.: US16937446Application Date: 2020-07-23
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Publication No.: US11353989B2Publication Date: 2022-06-07
- Inventor: Steve Porter Hotelling , Brian Richards Land
- Applicant: Apple Inc.
- Applicant Address: US CA Cupertino
- Assignee: Apple Inc.
- Current Assignee: Apple Inc.
- Current Assignee Address: US CA Cupertino
- Agency: Kubota & Basol LLP
- Main IPC: G09G5/00
- IPC: G09G5/00 ; G06F3/041 ; G06F3/044

Abstract:
A touch surface device having improved sensitivity and dynamic range is disclosed. In one embodiment, the touch surface device includes a touch-sensitive panel having at least one sense node for providing an output signal indicative of a touch or no-touch condition on the panel; a compensation circuit, coupled to the at least one sense node, for generating a compensation signal that when summed with the output signal removes an undesired portion of the output signal so as to generated a compensated output signal; and an amplifier having an inverting input coupled to the output of the compensation circuit and a non-inverting input coupled to a known reference voltage.
Information query