Patents by Inventor Eduardo L. Elizondo

Eduardo L. Elizondo 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).

  • Agile bandpass filter
    Patent number: 5300838
    Abstract: Two variable frequency, fixed bandwidth bandpass 10, 410 are cascaded to form a bandpass filter with variable center frequency and variable bandpass. Each filter 10, 410 includes first (16, 416) and second (24, 424) mixers separated by a fixed bandpass filter (20, 420). Each mixer includes a control input terminal 30, 32: 430, 432 which receives a control signal (f.sub.LO, f.sub.OFF). The center frequency of the filter arrangement is controlled by the frequency of control signal f.sub.LO, and the bandwidth is controlled by the difference frequency between f.sub.LO and f.sub.OFF. A tracking arrangement 456 allows direct control of the bandpass by control of the frequency of an offset oscillator 458.
    Type: Grant
    Filed: May 20, 1992
    Date of Patent: April 5, 1994
    Assignee: General Electric Co.
    Inventor: Eduardo L. Elizondo