Patents by Inventor Paul H. Gilbert

Paul H. Gilbert 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).

  • Discrete automatic gain control with high stability, high speed and low distortion
    Patent number: 5161170
    Abstract: High speed automatic gain control (AGC) circuitry, capable of use in pulse or CW systems, incorporates hysteresis for improving the stability and distortion characteristics of the AGC. After a gain setting is selected, the built-in hysteresis feature prevents an adjustment in that gain setting until the amplitude of the input signal varies more than a predetermined amount. Sampling of the amplitude of the input signal and gain adjustments are accomplished by digital circuitry. In one embodiment, AGC is on a pulse-to-pulse basis.
    Type: Grant
    Filed: January 16, 1990
    Date of Patent: November 3, 1992
    Assignee: The Johns Hopkins University
    Inventors: Paul H. Gilbert, Ronald G. Niemann, Robert L. Trapp
  • Phase demodulator utilizing a frequency divider, synchronous filter, and phase comparator
    Patent number: 4419630
    Abstract: A phase demodulator for recovering the modulating wave from a phase-moduld wave. A frequency divider is provided to divide the phase-modulated wave in frequency to produce a phase-modulated subharmonic wave which is compared in a phase comparator with a signal produced by passing the phase-modulated subharmonic wave through a syncrhonous filter set at its carrier frequency. The filtered output of the phase comparator is proportional to the amplitude of the modulating wave.
    Type: Grant
    Filed: May 5, 1981
    Date of Patent: December 6, 1983
    Assignee: The United State of America as represented by the Secretary of the Navy
    Inventor: Paul H. Gilbert