Patents by Inventor Sudarshan Varshney

Sudarshan Varshney 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: 6157207
    Abstract: To protect logic module output devices from high voltages, logic modules are not powered during antifuse programming. In some embodiments, two separate power input terminals VCC1 and VCC2 are provided: power input terminal VCC1 being coupled to power the logic modules, and power input terminal VCC2 being coupled to power the programming control circuitry. Power terminal VCC1 is left floating or is grounded during antifuse programming such that the logic modules are not powered but such that the programming circuitry is powered during antifuse programming via the second power terminal VCC2. Logic module output protection transistors are not required nor is the associated charge pump. Because the logic module input devices are not powered, a current surge through the input devices on power up does not occur and an internal disable signal and associated circuitry is not required.
    Type: Grant
    Filed: May 11, 1998
    Date of Patent: December 5, 2000
    Assignee: QuickLogic Corporation
    Inventors: David D. Eaton, Sudarshan Varshney, Paige A. Kolze