Ring oscillator based RC calibration circuit
US10826501B1 · kind B1 · utility
5Cited by
3References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 24, 2019 |
| Grant date | Nov 3, 2020 |
| Priority date | — |
| Expiry date | Jun 24, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H2210/043
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A calibration operation adjusts a frequency of a ring oscillator to a desired frequency by adjusting programmable RC circuits in the stages of the ring oscillator. The programmable RC circuits have programmable capacitors, resistors, or both. The RC circuits account for most of the delay through the ring oscillator. Another circuit with its own RC time constant is calibrated based on the adjustments made to the RC circuits in the ring oscillator to achieve the desired frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.