Patents by Inventor Jieh-Tsomg Wu

Jieh-Tsomg Wu 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).

  • Patent number: 6822601
    Abstract: A multiplying digital-to-analog converter (MDAC) stage includes a plurality of second capacitances in parallel selectively connected between an input node and an amplifier input and between a corresponding plurality of digital reference signals, which can include a pseudo-random first calibration signal, and the amplifier input. A pipelined ADC incorporating a series of such MDAC stages includes a multiplier connected to the last MDAC stage of the series, a low-pass filter for filtering output of the multiplier and outputting a DC component, and an encoder for receiving output of the MDAC stages and generating a digital output signal and for compensating the digital output signal with the DC component. Background calibration of the ADC includes applying the first calibration signal to a second capacitance of the MDAC stage during a hold phase, and filtering the first calibration signal from the digital output of the pipelined analog-to-digital converter.
    Type: Grant
    Filed: July 23, 2003
    Date of Patent: November 23, 2004
    Assignee: Silicon Integrated Systems Corp.
    Inventors: Hung-Chih Liu, Jieh-Tsomg Wu, Zwei-Mei Lee