Clock and data recovery circuit with bidirectional frequency detection and electronic device using the same
US9559705B1 · kind B1 · utility
Assignees
Inventors
Key dates
| Filing date | Nov 27, 2015 |
| Grant date | Jan 31, 2017 |
| Priority date | — |
| Expiry date | Nov 27, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L2207/06
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A clock and data recovery (CDR) circuit is provided. A phase detection circuit receives an input signal and a clock signal to output a first voltage signal. A first comparing circuit determines whether the first voltage signal is within a voltage range to output a first up signal and a first down signal. A counting circuit updates a counting value according to the input signal and the clock signal. A second comparing circuit determines whether the counting value is within a value range to output a second up signal and a second down signal. A selection circuit outputs a second voltage signal according to the first up signal, the first down signal, the second up signal, and the second down signal. A voltage controlled oscillator outputs the clock signal according to the first voltage signal and the second voltage signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.