Dual frequency voltage controlled oscillator circuit
US6842081B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 6, 2002 |
| Grant date | Jan 11, 2005 |
| Priority date | — |
| Expiry date | Jun 6, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03B5/1253
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An oscillator for generating a fundamental frequency signal and harmonic signal to provide multiple radio frequency signals. First and second bipolar transistors are differentially connected, and have base and collector terminals cross-coupled. A pair of inductors serially connect the collectors of the transistors to one terminal of a d.c. power supply source. A current source connects to the other terminal of the d.c. power supply source and to the emitters of the differentially connected transistor. A tuning capacitor connected between collector terminals establishes a resonant frequency for the oscillator. Crosscoupling is affected at a level that produces harmonic signals which can be used along with a fundamental frequency signal in numerous radio telecommunications applications.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.