Locked loop circuit and method with digitally-controlled oscillator (DCO) gain normalization
US11070216B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 6, 2020 |
| Grant date | Jul 20, 2021 |
| Priority date | — |
| Expiry date | Apr 6, 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) coupled to the output of the loop filter. 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 method includes determining a calibration DCO codeword representing a calibration operating point for the locked-loop circuit; determining a scaling factor based on the calibration operating point, the scaling factor based on a ratio of an actual DCO gain to a nominal DCO gain; and applying the scaling factor to operating parameters of the loop filter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.