Locked loop circuit and method with digitally-controlled oscillator (DCO) gain normalization
US11070215B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 17, 2020 |
| Grant date | Jul 20, 2021 |
| Priority date | — |
| Expiry date | Mar 17, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L2207/50
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A method of operation in a locked-loop circuit. The locked-loop circuit includes a loop filter and a digitally-controlled oscillator (DCO). The loop filter includes a first input to receive a digital word representing a difference between a reference clock frequency and a DCO output frequency. The loop filter includes internal storage. The method includes selecting a desired DCO output frequency that is generated in response to a calibration DCO codeword. A start value is retrieved from the loop filter internal storage. The start value corresponds to the calibration DCO codeword. The locked-loop circuit is then started with the retrieved start value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.