Supply voltage drift insensitive digitally controlled oscillator and phase locked loop circuit
US9306577B2 · kind B2 · utility
3Cited by
14References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 27, 2013 |
| Grant date | Apr 5, 2016 |
| Priority date | — |
| Expiry date | May 13, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L2207/08
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A digitally controlled oscillator includes a ring oscillator and a first supplementary circuit. The ring oscillator is coupled to a supply voltage and generates a signal oscillated at an oscillating frequency. The oscillating frequency is controlled by a digital code and further varies with a supply voltage drift in a first direction. The first supplementary circuit is coupled to the ring oscillator and facilitates the oscillating frequency to vary with the supply voltage drift in a second direction reverse to the first direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.