Patents by Inventor Rahim F. Chowdhury

Rahim F. Chowdhury has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Capacitive touch sense architecture having a correlator for demodulating a measured capacitance from an excitation signal
    Patent number: 9857932
    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.
    Type: Grant
    Filed: March 31, 2017
    Date of Patent: January 2, 2018
    Assignee: QUALCOMM Incorporated
    Inventors: Ozan E. Erdogan, Guozhong Shen, Rajesh Anantharaman, Ajay Taparia, Behrooz Javid, Syed T. Mahmud, Rahim F. Chowdhury
  • Capacitive touch sense architecture having a correlator for demodulating a measured capacitance from an excitation signal
    Patent number: 9846186
    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.
    Type: Grant
    Filed: November 3, 2014
    Date of Patent: December 19, 2017
    Assignee: QUALCOMM Incorporated
    Inventors: Ozan E. Erdogan, Guozhong Shen, Rajesh Anantharaman, Ajay Taparia, Behrooz Javid, Syed T. Mahmud, Rahim F. Chowdhury
  • CAPACITIVE TOUCH SENSE ARCHITECTURE HAVING A CORRELATOR FOR DEMODULATING A MEASURED CAPACITANCE FROM AN EXCITATION SIGNAL
    Publication number: 20170205948
    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.
    Type: Application
    Filed: March 31, 2017
    Publication date: July 20, 2017
    Inventors: Ozan E. Erdogan, Guozhong Shen, Rajesh Anantharaman, Ajay Taparia, Behrooz Javid, Syed T. Mahmud, Rahim F. Chowdhury