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公开(公告)号：US20170205948A1
公开(公告)日：2017-07-20
申请号：US15476745
申请日：2017-03-31
Applicant: QUALCOMM Incorporated
Inventor： Ozan E. Erdogan , Guozhong Shen , Rajesh Anantharaman , Ajay Taparia , Behrooz Javid , Syed T. Mahmud , Rahim F. Chowdhury
CPC classification number: G01R27/2605 , G06F3/0416 , 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.
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公开(公告)号：US09625507B2
公开(公告)日：2017-04-18
申请号：US14172158
申请日：2014-02-04
Applicant: Qualcomm Incorporated
Inventor： Ozan E. Erdogan , Guozhong Shen , Rajesh Ananthararman , Ajay Taparia , Behrooz Javid , Syed T. Mahmud
CPC classification number: G01R27/2605 , G01D5/24 , G06F3/0416 , G06F3/044
Abstract: A system includes a signal generator and a correlator. The signal generator outputs a first signal to a first end of a capacitance to be measured. The correlator is connected to an output of the signal generator that outputs the first signal and to a second end of the capacitance. The correlator receives the first signal from the output of the signal generator and receives a second signal from the second end of the capacitance. The correlator correlates the first signal and the second signal and generates an output signal based on a correlation between the first signal and the second signal. The output signal is proportional to a capacitance value of the capacitance.
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公开(公告)号：US09857932B2
公开(公告)日：2018-01-02
申请号：US15476745
申请日：2017-03-31
Applicant: QUALCOMM Incorporated
Inventor： Ozan E. Erdogan , Guozhong Shen , Rajesh Anantharaman , Ajay Taparia , Behrooz Javid , Syed T. Mahmud , Rahim F. Chowdhury
CPC classification number: G01R27/2605 , G06F3/0416 , 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.
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公开(公告)号：US09846186B2
公开(公告)日：2017-12-19
申请号：US14530889
申请日：2014-11-03
Applicant: Qualcomm Incorporated
Inventor： Ozan E. Erdogan , Guozhong Shen , Rajesh Anantharaman , Ajay Taparia , Behrooz Javid , Syed T. Mahmud , Rahim F. Chowdhury
CPC classification number: G01R27/2605 , G06F3/0416 , 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.
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