Patents by Inventor Magaret A. Feisel

Magaret A. Feisel 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).

  • Method and apparatus for variable phasing of periodic signals
    Patent number: 4680621
    Abstract: A periodic output signal is generated at a variable phase relative to a periodic input signal by comparing the input signal with a third periodic signal that has a frequency which is less than the frequency of the input signal and that has a duty cycle which is equal to one-half of the ratio of the frequency of the third periodic signal to the frequency of the input signal. The phase difference is detected between the input signal and a frequency component of the third periodic signal which has the same frequency as the input signal. The output signal is generated at a frequency to maintain a predetermined phase relationship between the periodic input signal and the frequency component of the third periodic signal, and the phase of the output signal relative to the third periodic signal is varied.
    Type: Grant
    Filed: September 16, 1985
    Date of Patent: July 14, 1987
    Assignee: Tektronix, Inc.
    Inventors: Daniel G. Baker, Magaret A. Feisel