Invention Grant
- Patent Title: Capacitive touch sense architecture having a correlator for demodulating a measured capacitance from an excitation signal
- Patent Title (中): 具有用于从激励信号解调测量电容的相关器的电容式触摸感知架构
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Application No.: US13403873Application Date: 2012-02-23
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Publication No.: US08878797B2Publication Date: 2014-11-04
- Inventor: Ozan E. Erdogan , Guozhong Shen , Rajesh Anantharaman , Ajay Taparia , Behrooz Javid , Syed T. Mahmud , Rahim Chowdhury
- Applicant: Ozan E. Erdogan , Guozhong Shen , Rajesh Anantharaman , Ajay Taparia , Behrooz Javid , Syed T. Mahmud , Rahim Chowdhury
- Applicant Address: US CA San Jose
- Assignee: Maxim Integrated Products, Inc.
- Current Assignee: Maxim Integrated Products, Inc.
- Current Assignee Address: US CA San Jose
- Agency: Advent, LLP
- Main IPC: G06F3/041
- IPC: G06F3/041 ; G01R27/26 ; G06F3/044
Abstract:
An analog front end circuit utilizes coherent detection within a capacitance measurement application. The analog front end circuit uses coherent detection to measure capacitance of a touch screen display. An analog excitation signal is modulated by a capacitor to be measured. The modulated signal is synchronously demodulated using a correlator, which includes a discrete mixer and a discrete integrator. The excitation signal is also input to the mixer such that the modulated signal is multiplied by the excitation signal. The excitation signal is an analog signal having a sine wave function or other waveform.
Public/Granted literature
- US20130162586A1 CAPACITIVE TOUCH SENSE ARCHITECTURE Public/Granted day:2013-06-27
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