Patents by Inventor David B. Cooper

David B. Cooper 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: 6806744
    Abstract: A method and system is arranged to convert a differential low-voltage input signal (e.g. LVDS or RSDS) into a single-ended output signal. An operational trans-conductance amplifier (OTA) is configured to convert the input signal into a current. A trans-impedance stage is configured to convert the current into the single-ended output signal. The voltage associated with the output of the OTA corresponds to approximately VDD/2. The trans-impedance stage comprises an inverter circuit, a p-type transistor, and an n-type transistor. The transistors are arranged in a negative feedback configuration with the inverter. The single-ended output signal has a voltage swing that approximately corresponds to the sum of the VGS of the n-type transistor and the VGS of the p-type transistor. The output signal may be buffered by additional circuits such as an inverter, a Schmitt, as well as others.
    Type: Grant
    Filed: October 3, 2003
    Date of Patent: October 19, 2004
    Assignee: National Semiconductor Corporation
    Inventors: Marshall J. Bell, David B. Cooper, James Kozisek