Patents Assigned to Aado J. Perandi
  • Patent number: 4801893
    Abstract: Improved forward transimpedance amplifiers are provided using a field effect transistor first amplification stage, direct coupled to a bipolar junction transistor second amplification stage. In some embodiments an optional third bipolar junction transistor amplification stage is provided, direct coupled from the second stage. Negative feedback signals are connected from the output of the bipolar junction transistor stage to the input of the field effect transistor stage. The invention provides simple and low-cost amplifiers with very high forward transimpedance and other performance characteristics approaching those of an ideal amplifier, permitting the realization of a nearly ideal transimpedance amplifier with performance characteristics dominated by its feedback network.
    Type: Grant
    Filed: September 10, 1986
    Date of Patent: January 31, 1989
    Assignees: Frank L. VanAlstine, Aado J. Perandi, David H. Umeda
    Inventor: Aado J. Perandi