Voltage controlled push-push oscillator with parallel resonant tank circuits
US5231361A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 5, 1990 |
| Grant date | Jul 27, 1993 |
| Priority date | — |
| Expiry date | Feb 5, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03B2201/0208
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The present invention resides in a push-push voltage controlled oscillator (VCO) utilizing parallel LC resonant tank circuits for improved phase noise characteristics. The push-push VCO of the present invention includes two voltage controlled oscillators connected in parallel and in phase opposition, with each oscillator including a transistor connected in series with the parallel LC resonant tank circuit. The oscillators operate at the same resonant frequency f.sub.0, but are 180 degrees out of phase. Therefore, the fundamental and odd harmonics of the resonant frequency f.sub.0 cancel each other out and the even harmonics add together to produce an output signal at twice the resonant frequency f.sub.0.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.