Wideband phase-locked loop with adaptive frequency response that tracks a reference
US7634038B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 24, 2006 |
| Grant date | Dec 15, 2009 |
| Priority date | — |
| Expiry date | Dec 21, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K9/06
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A self-tuning 3rd order type III phase-locked loop (PLL) is disclosed. In one aspect, the PLL provides frequency control that is implemented in three (3) parallel paths. The PLL provides frequency response tracking using a number of elements including a triple control voltage-controlled oscillator (VCO), a frequency-to-current (F2I) converter, and a switched capacitor loop filter. In addition to compensation for feedback ratio variation, near constant F2I gain over process variations and switched capacitor filters synchronized to a reference signal, near constant VCO gain over process variations allows the open loop frequency response to be tailored to track the reference signal. A high-speed locking technique is employed which significantly reduces acquisition time in low bandwidth cases. This PLL may be fabricated in a 0.18 μm CMOS logic process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.