Patents Represented by Attorney, Agent or Law Firm Edward Mao
  • Process compensated phase locked loop
    Patent number: 6683502
    Abstract: A phase locked loop having a voltage-controlled oscillator is adjusted to compensate for process variations in the formation of the phase locked loop. In each instance of the phase locked loop, the center frequency of the voltage-controlled oscillator is adjusted using a bias signal while holding the control voltage of the voltage-controlled oscillator at zero. Then, the control voltage of the voltage-controlled oscillator is set to a different value and the gain of the voltage-controlled oscillator is adjusted.
    Type: Grant
    Filed: March 12, 2002
    Date of Patent: January 27, 2004
    Assignee: Xilinx, Inc.
    Inventors: Eric D. Groen, Charles W. Boecker