Patents by Inventor Charles Yong Yi Guan

Charles Yong Yi Guan 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).

  • Capacitance detection circuit that detects minute changes in capacitance
    Patent number: 9964576
    Abstract: A capacitance detection circuit detects changes in the capacitance of a variable capacitor by using the change in capacitance to change the resonant frequency of a variable capacitor oscillator. The resonant frequency of the variable capacitor oscillator is converted from the time domain to the frequency domain, and then selected frequencies values are compared to known frequency domain values to detect the magnitude of the change in capacitance.
    Type: Grant
    Filed: October 6, 2014
    Date of Patent: May 8, 2018
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Peyman Hojabri, Charles Yong Yi Guan
  • CAPACITANCE DETECTION CIRCUIT THAT DETECTS MINUTE CHANGES IN CAPACITANCE
    Publication number: 20150097577
    Abstract: A capacitance detection circuit detects changes in the capacitance of a variable capacitor by using the change in capacitance to change the resonant frequency of a variable capacitor oscillator. The resonant frequency of the variable capacitor oscillator is converted from the time domain to the frequency domain, and then selected frequencies values are compared to known frequency domain values to detect the magnitude of the change in capacitance.
    Type: Application
    Filed: October 6, 2014
    Publication date: April 9, 2015
    Applicant: Texas Instruments Incorporated
    Inventors: Peyman Hojabri, Charles Yong Yi Guan
  • Apparatus and method for signal voltage limiting
    Patent number: 7554377
    Abstract: A circuit and method for limiting a signal voltage in which the minimum and maximum levels of the output signal can be controlled by selectively applying different lower and higher reference voltages from which the minimum and maximum output signal levels are derived.
    Type: Grant
    Filed: September 17, 2007
    Date of Patent: June 30, 2009
    Assignee: National Semiconductor Corporation
    Inventor: Charles Yong Yi Guan
  • Method and apparatus for vertical S linearity correction with no external components
    Patent number: 6577083
    Abstract: A method and apparatus for vertical S linearity correction with no external components. A periodic waveform may be cubed to produce a second waveform. This second waveform may be sampled to obtain a peak value of the periodic waveform. The peak value may be multiplied by a constant to produce an offset value. The offset value may be subtracted from the second waveform to produce a third waveform. This third waveform may be added to the periodic ramp voltage. Consequently, the periodic waveform is modified by a cubic waveform.
    Type: Grant
    Filed: October 9, 2001
    Date of Patent: June 10, 2003
    Assignee: National Semiconductor Corporation
    Inventor: Charles Yong Yi Guan