Patents by Inventor Maher Sarraj

Maher Sarraj 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).

  • Method and apparatus for implementing a pipelined A/D converter with inter-stage amplifiers having no common mode feedback circuitry
    Patent number: 6031480
    Abstract: A pipelined analog-to-digital converter is disclosed having a plurality of sample and hold converter stages, each having an interstage amplifier (28) associated therewith. This is a differential amplifier that is implemented without common-mode feedback. The sample and hold stage operates on a reset phase and a gain/DAC phase, wherein the output of the reconstructive DAC is summed with the input to the amplifier (28). A differential input amplifier (60) has the inputs thereof set to common-mode input voltage with a feedback capacitor biased to a common-mode output bias point. During the gain/DAC phase, the bias input is removed and the feedback capacitor connected across the input/output of the amplifier (60). This effectively establishes the common-mode bias points for use by the amplifier (60) during the gain/DAC phase.
    Type: Grant
    Filed: November 4, 1997
    Date of Patent: February 29, 2000
    Assignee: Texas Instruments Incorporated
    Inventors: Eric G. Soenen, Maher Sarraj