Voltage controlled oscillator, frequency synthesizer and communication apparatus
US7221920B2 · kind B2 · utility
8Cited by
8References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 15, 2004 |
| Grant date | May 22, 2007 |
| Priority date | — |
| Expiry date | May 9, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L2207/06
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A voltage controlled oscillator includes a resonator configured to resonate with an initial oscillation frequency during starting period of oscillation and a steady oscillation frequency during a steady state oscillation. The resonator includes a film bulk acoustic resonator having a series resonance frequency higher than the steady oscillation frequency. A negative resistance circuit configured to drive the resonator, has a positive increment for reactance in the steady state oscillation compared with reactance in the starting period.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.