Patent ID: 6157821
Filing Date: 2000-12-05
Classification: H03L,H04B

Abstract:
A method of operating a phase locked loop circuit comprising:generating an output signal from a voltage controlled oscillator (VCO);applying an input voltage from a charge pump to said VCO;receiving said output signal from said VCO in a first divider and outputting a divided signal to a phase detector;receiving a reference frequency signal at a second divider and applying the reference frequency signal to said phase detector;outputting a signal from said phase detector to said charge pump;receiving a reference frequency signal at a third divider and applying an output signal to a voltage step-up unit; andmultiplying a supply voltage input to the charge pump, wherein the step of multiplying comprising:connecting a first and second switch to a supply voltage source;connecting said first switch to a third switch and a bucket capacitor;connecting said second switch to a fourth switch and said bucket capacitor;grounding said fourth switch;connecting said third switch to a supply voltage output and to a reservoir capacitor; andgrounding said reservoir capacitor.