Spread spectrum clock generator, electronic apparatus, and spread spectrum clock generation method
US9813068B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 1, 2015 |
| Grant date | Nov 7, 2017 |
| Priority date | — |
| Expiry date | May 10, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/16
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A spread spectrum clock generator includes a phase comparator that compares a reference clock with a feedback clock, a low-pass filter that passes a predetermined low-frequency component, a phase lock loop that includes a voltage-controlled oscillator generating an output clock whose frequency corresponds to the filtered signal, a triangular wave controller that generates a triangular wave signal for frequency-modulating the spread spectrum clock based on the output clock, a delay controller that generates the feedback clock by controlling delay of the output clock based on the triangular wave signal, a first counter that counts the output clock and output a first count value, a second counter that counts the reference clock and output a second count value, and a phase error correction circuit that compares the first count value with the second count value and corrects phase error of the output clock.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.