Local oscillator architecture to reduce transmitter pulling effect and minimize unwanted sideband
US6850749B2 · kind B2 · utility
19Cited by
9References
23Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 27, 2002 |
| Grant date | Feb 1, 2005 |
| Priority date | — |
| Expiry date | Jul 29, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03B2200/0078
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A local oscillator architecture provides a signal at an output frequency with reduced pulling effect. A voltage controlled oscillator (VCO) generates a first signal having a frequency that is a fraction of the output frequency. A frequency shifter generates a second signal with a frequency substantially equal to the difference between the VCO frequency and the output frequency. Single-sideband mixers are used to produce output signals at the sum of the VCO frequency and the shifted frequency while suppressing an unwanted sideband at the difference of the two frequencies.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.