Patents by Inventor Stephen T. Machan

Stephen T. Machan 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 reconfigurable frequency generation
    Patent number: 7869769
    Abstract: A frequency generator (100) takes a signal source (clock or carrier) (101) and generates a edge encoded direct digital modulated differential output signal (110). The differential signal (110) is applied to a frequency extension quadrature generator (FEQG) (112). The FEQG (112) includes a fractional differential wavelength delay locked loop (DLL) (280) and a frequency multiplier (240). The DLL (280) generates a control voltage (214) with which to control delays of the edge encoded modulation signal (110). A frequency extended quadrature function is applied to the periodic steady state input signal with edge encoded modulation (110), to provide the output signal set 113.
    Type: Grant
    Filed: November 28, 2007
    Date of Patent: January 11, 2011
    Assignee: Motorola, Inc.
    Inventors: Robert E. Stengel, Thomas L. Gradishar, Stephen T. Machan
  • METHOD AND APPARATUS FOR RECONFIGURABLE FREQUENCY GENERATION
    Publication number: 20090137211
    Abstract: A frequency generator (100) takes a signal source (clock or carrier) (101) and generates a edge encoded direct digital modulated differential output signal (110). The differential signal (110) is applied to a frequency extension quadrature generator (FEQG) (112). The FEQG (112) includes a fractional differential wavelength delay locked loop (DLL) (280) and a frequency multiplier (240). The DLL (280) generates a control voltage (214) with which to control delays of the edge encoded modulation signal (110). A frequency extended quadrature function is applied to the periodic steady state input signal with edge encoded modulation (110), to provide the output signal set 113.
    Type: Application
    Filed: November 28, 2007
    Publication date: May 28, 2009
    Applicant: MOTOROLA, INC.
    Inventors: Robert E. Stengel, Thomas L. Gradishar, Stephen T. Machan
  • Two port voltage controlled oscillator for use in wireless personal area network synthesizers
    Patent number: 6987423
    Abstract: A voltage controlled oscillator (VCO) for use in a personal area network synthesizer includes a delay cell (100), a first current amplifier (201, 203) for amplifying an input current, a resister capacitor (RC) tuning network (207, 209, 211) for varying the amount of amplification and delay of an output of the first current amplifier. A second current amplifier (213, 215) is then used for amplifying an output current from the RC tuning network. The invention includes a unique composite voltage variable capacitor (CVVC) (300) for precisely tuning the amount of delay presented by the delay cell. The unique topology of the delay cell (100) allows it to be readily used in voltage controlled oscillators (VCOs) operable at frequencies above 1 GHz.
    Type: Grant
    Filed: August 19, 2003
    Date of Patent: January 17, 2006
    Assignee: Freescale Semiconductor, Inc.
    Inventors: Daniel E. Brueske, David B. Harnishfeger, Stephen T. Machan