Auto frequency calibration for a phase locked loop and method of use
US9490819B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 23, 2015 |
| Grant date | Nov 8, 2016 |
| Priority date | — |
| Expiry date | Jan 23, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L2207/50
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An apparatus comprises a code generator configured to generate a coarse tuning signal and a reset signal based on a reference frequency and a phase difference signal. The apparatus also comprises a digital loop filter configured to generate a fine tuning signal based on the phase difference signal. The apparatus further comprises a voltage control oscillator configured to generate an output signal based on the coarse tuning signal and the fine tuning signal. The apparatus additionally comprises a divider configured to generate a divider frequency based on a divider control signal and the output signal. The phase difference signal is based, at least in part, on the divider frequency, and the divider is configured to be reset based on the reset signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.