Tuning circuit having electronically trimmed VCO
US6806781B2 · kind B2 · utility
10Cited by
5References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 23, 2001 |
| Grant date | Oct 19, 2004 |
| Priority date | — |
| Expiry date | Apr 5, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/099
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A voltage controlled oscillator (38) includes an LC tank (20) and a capacitor bank (21). LC tank (20) includes an inductor (12) and a varactor (14). The capacitive output of the varactor is controlled by a control voltage &ngr;. To electronically tune the voltage controlled oscillator, a set of capacitors (24) in the capacitor bank (21) are enabled by a digital control signal based on a frequency comparison with a desired frequency. Once the capacitor bank is set, the frequency can be locked at the desired frequency by the phase lock loop.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.