Voltage Controlled Oscillator (VCO) with a wide tuning range and substantially constant voltage swing over the tuning range
US7777581B2 · kind B2 · utility
64Cited by
3References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 23, 2007 |
| Grant date | Aug 17, 2010 |
| Priority date | — |
| Expiry date | Jan 1, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/18
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A wide tuning range and constant swing VCO is described that is based on a multipass Ring Oscillator enhanced with feed-backward connections. This VCO is designed to overcome tuning range limitations of prior-art “feed-forward” ring oscillators. The Feedback multipass Ring Oscillator of the invention provides decreasing frequency when tuned by increasing the feedback, thus covering a much wider tuning range irrespective of the speed limit of the technology while at the same time providing almost constant amplitude.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.