Phase-locked loop circuit
US8816735B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 24, 2013 |
| Grant date | Aug 26, 2014 |
| Priority date | — |
| Expiry date | Oct 24, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L2207/50
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A phase-locked loop circuit, a phase converter module thereof and a phase-locked controlling method are disclosed herein. The phase converter module is suitable for a phase-locked loop circuit including a digitally-controlled oscillator (DCO) for generating an oscillator output signal and a divider for converting the oscillator output signal into N-phased oscillator output signals. The phase converter module includes a phase finder and a time-to-digital converter. The phase finder is configured for sampling the oscillator output signal with the N-phased oscillator output signals to calculate an estimated value of a fractional phase part. One oscillation period of the digitally-controlled oscillator is divided into N sub-periods. The time-to-digital converter is configured for sampling one of the N-phased oscillator output signals with a reference-frequency signal to calculate a precise value of the fractional phase part within one sub-period.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.