Patents by Inventor Yogishwar K. Puri

Yogishwar K. Puri 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: 5117129
    Abstract: A full swing CMOS logic circuit provides fault tolerant, cold sparing of VLSI logic devices attached to a high speed bus. P-channel FET transistors are formed in an N-well which has a biasing transistor which effectively decouples the circuit when the circuit is not powered. The input/output interface of the cold spares have a high impedance and do not corrupt an interconnected electronic bus. The final drive transistors are reverse biased or clamped to zero to prevent any leakage paths.
    Type: Grant
    Filed: October 16, 1990
    Date of Patent: May 26, 1992
    Assignee: International Business Machines Corporation
    Inventors: Joseph A. Hoffman, Derwin L. Jallice, Yogishwar K. Puri, Randall G. Richards
  • Patent number: 4471454
    Abstract: A digital adder circuit is disclosed which employs non-DC current configurations to significantly reduce power, device count, and delay in performing binary addition. The circuit features a carry propagate transfer FET device whose gate is controlled by a carry propagate control circuit which selectively gates on the transfer FET device at a particular adder bit stage when the carry-in binary bit is to be transferred as the carry-out binary bit, which takes place when the augend input bit and addend input bit at that stage are not equal. The circuit additionally features a carry generate control circuit which is connected to the carry-out node of the FET transfer device, which selectively connects that node to either a drain potential when both inputs are unity or to ground potential when both inputs are zero, thereby efficiently generating the carry-out bit without regard for the state of the carry-in bit.
    Type: Grant
    Filed: October 27, 1981
    Date of Patent: September 11, 1984
    Assignee: IBM Corporation
    Inventors: Ziba T. Dearden, Yogishwar K. Puri, William W. Sproul, III