Patents Examined by Steven J. Mattola
  • Patent number: 4752745
    Abstract: A high fidelity audio amplifier of the push-pull complementary symmetry type, featuring a feedback circuit with a bias sensing element connected to the output terminals of the output transistors. The feedback circuit includes a photoemitting element in optical communication with a photoconductive element which determines the relative voltage difference of the input terminals of the complementary symmetry output transistors.
    Type: Grant
    Filed: August 18, 1987
    Date of Patent: June 21, 1988
    Assignee: Threshold Corporation
    Inventor: Nelson S. Pass
  • Patent number: 4575685
    Abstract: An arrangement for cancelling the input bias current, at picoampere levels, in linear integrated circuits such as operational amplifiers, comparators, and the like is disclosed herein. This arrangement utilizes circuitry including a tracking transistor which is virtually independent of the presence or absence of leakage current in the overall integrated circuit, even at relatively high temperatures, for example C., where leakage current can be most significant.
    Type: Grant
    Filed: August 3, 1984
    Date of Patent: March 11, 1986
    Assignee: Linear Technology Corporation
    Inventors: Robert C. Dobkin, George Erdi, Carl T. Nelson