Split varactor array with improved matching and varactor switching scheme
US8779867B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 26, 2011 |
| Grant date | Jul 15, 2014 |
| Priority date | — |
| Expiry date | Oct 26, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03J2200/10
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
One embodiment of the present invention relates to a digital controlled oscillator. The oscillator includes an oscillator circuit, a varactor array, and a control circuit. The oscillator circuit receives a control word and a signal and generates an oscillator clock signal from the signal at a frequency selected by the control word. The varactor array has a first array of varactor cells having incremental capacitance values and a second array of varactor cells having equal capacitance values. The split varactor array provides a capacitance value. A control circuit is coupled to the oscillator circuit and controls the split varactor array according to the control word. The control circuit sets varactor cells of the split varactor array on or off.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.