Patents Examined by Pellinen A. D.
  • Patent number: 5107264
    Abstract: A digital clock frequency multiplication and data serialization circuit for converting Q parallel data bits into a serial data stream is provided. A clock phase generator is coupled to receive the clock signal of the Q parallel data bits and output in response thereto Q synchronous clocks each of different phase. Logic circuitry is coupled to simultaneously receive the Q synchronous clocks and the Q parallel data bits. The Q synchronous clocks are used by the logic to gate a respective one of the Q parallel data bits such that the Q parallel data bits are sequentially output therefrom as a serial data stream. Circuits are provided for simultaneous frequency multiplication and return-to-zero data serialization and simultaneous frequency multiplication and nonreturn-to-zero data serialization. Further, digital clock frequency multiplication and synchronization circuits for converting a low frequency signal to a high frequency signal are described.
    Type: Grant
    Filed: September 26, 1990
    Date of Patent: April 21, 1992
    Assignee: International Business Machines Corporation
    Inventor: Ilva I. Novof
  • Patent number: 5072221
    Abstract: A parallel analog-to-digital converter having comparators in a sequence with two sets of logic gates having inputs electrically connected to selected primary and complementary outputs of the comparators.
    Type: Grant
    Filed: August 4, 1988
    Date of Patent: December 10, 1991
    Assignee: Signal Processing Technologies, Inc.
    Inventor: Robert R. Schmidt
  • Patent number: 4736268
    Abstract: An AC solid state switch includes an inverse parallel connection of a pair of silicon controlled rectifiers. A circuit branch which includes the series connection of the main conducting paths of a pair of field effect transistors is electrically connected in parallel with the inverse parallel arrangement of silicon controlled rectifiers. Gate power sources provide continuous gate drive signals to the silicon controlled rectifiers and field effect transistors. By including the field effect transistors, voltage transients across the switch are reduced in high frequency AC power systems.
    Type: Grant
    Filed: December 18, 1986
    Date of Patent: April 5, 1988
    Assignee: Westinghouse Electric Corp.
    Inventor: Robert G. Wagoner