Supply-regulated phase-locked loop (PLL) and method of using
US7973612B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 26, 2009 |
| Grant date | Jul 5, 2011 |
| Priority date | — |
| Expiry date | Jul 10, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/22
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A supply-regulated Phase-locked loop (PLL) is provided. The PLL comprises a supply-regulating loop, a voltage-controlled oscillator (VCO), and a programmable decoupling capacitor array for the VCO. The capacitance of the VCO decoupling capacitor array is adjustable to be equal to N times CUNIT, where N is the current value of a multiplication factor of a divide-by-N circuit and CUNIT is a unit capacitance characterized for a processing technology chosen for fabricating the decoupling capacitor array. When the PLL switches from one frequency band to another, a higher-order pole introduced by the VCO decoupling capacitor tracks the PLL reference frequency, thus improving the PLL operational stability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.