Patents by Inventor William Joseph Hulka

William Joseph Hulka 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: 6194941
    Abstract: A DC offset compensation circuit (34) for compensating for a DC offset voltage of a signal amplifier (24) includes a first sample and hold circuit (40) having an input receiving an amplifier output signal (VOUT2) and an output supplying the sampled and held output signal (VOUT2) to a non-inverting input of a comparator 42. A first digital-to-analog (D/A) circuit (46) is responsive to a number of digital input signals to produce an analog DC target signal at an output (VD) thereof. The analog DC target signal is provided to an input of a second sample and hold circuit (50) having an output supplying the sampled and held analog DC target signal to an inverting input of the comparator 42. The output of the comparator 42 is provided to an offset cancellation control circuit (56) including a state machine (66) and a counter circuit (68) operable to modify a count value (OFFDAC) thereof depending upon statuses of a number of input control signals (CLK1, CLK2, STRT, STP) and the comparator output signal (CO).
    Type: Grant
    Filed: April 13, 1999
    Date of Patent: February 27, 2001
    Assignee: Delphi Technologies, Inc.
    Inventors: Seyed Ramezan Zarabadi, Mark Russell Keyse, Pedro Enrique Castillo-Borelly, William Joseph Hulka