Patents Assigned to Telegent Systems, Inc.
  • Patent number: 7505086
    Abstract: An analog video receiver implemented in an integrated circuit device. The analog video receiver includes a mixing circuit to mix an analog video signal with a sinusoid to generate a frequency-shifted analog video signal, and an offset cancellation circuit to obtain a sample of the frequency-shifted analog video signal during a first time interval and, based on the sample, generate an offset cancellation signal that, when summed with the frequency-shifted analog video signal, reduces a substantially time-invariant offset in the frequency-shifted analog video signal.
    Type: Grant
    Filed: May 2, 2005
    Date of Patent: March 17, 2009
    Assignee: Telegent Systems, Inc.
    Inventors: Weijie Yun, Samuel Sheng
  • Patent number: 7501919
    Abstract: In a signal communication device, a frequency-selective filter has at least one component that is biased by a control signal to establish a center frequency of the frequency-selective filter. A closed-loop bias generator is provided to generate the control signal and to adjust the control signal based, at least in part, on a comparison of the control signal and a reference signal.
    Type: Grant
    Filed: March 6, 2008
    Date of Patent: March 10, 2009
    Assignee: Telegent Systems, Inc.
    Inventors: Samuel W. Sheng, Michael Khitrov
  • Patent number: 7453526
    Abstract: An analog video receiver implemented in an integrated circuit device. The analog video receiver includes an amplifier to amplify an analog video signal having a desired carrier frequency, and a mixing circuit to mix the amplified analog video signal with a complex sinusoid having a frequency substantially equal to the carrier frequency.
    Type: Grant
    Filed: May 2, 2005
    Date of Patent: November 18, 2008
    Assignee: Telegent Systems, Inc.
    Inventors: Weijie Yun, Samuel Sheng, Dennis G. Yee
  • Patent number: 7427907
    Abstract: In a signal communication device, a frequency-selective filter has at least one component that is biased by a control signal to establish a center frequency of the frequency-selective filter. A closed-loop bias generator is provided to generate the control signal and to adjust the control signal based, at least in part, on a comparison of the control signal and a reference signal.
    Type: Grant
    Filed: July 21, 2006
    Date of Patent: September 23, 2008
    Assignee: Telegent Systems, Inc.
    Inventors: Samuel W. Sheng, Michael Khitrov
  • Patent number: 7283074
    Abstract: A self-calibrating analog-to-digital converter (ADC). The ADC includes multiple component ADCs to generate respective digital representations of an input signal in response to respective timing signals that are offset in phase from one another, each component ADC having a gain setting that controls a magnitude of the digital representations. The ADC further includes correction circuitry to generate a plurality of fast-Fourier transforms (FFTs) that correspond to the digital representations of the input signal and to adjust the gain settings of the component ADCs and/or phase angles of the timing signals based on gain and phase errors indicated by the FFTs.
    Type: Grant
    Filed: September 21, 2005
    Date of Patent: October 16, 2007
    Assignee: Telegent Systems, Inc.
    Inventors: Samuel Sheng, Weijie Yun