Local oscillator with non-harmonic ratio between oscillator and RF frequencies using digital mixing and weighting functions
US7805122B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 24, 2007 |
| Grant date | Sep 28, 2010 |
| Priority date | — |
| Expiry date | Mar 22, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03B21/00
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A novel and useful apparatus for and method of local oscillator (LO) generation with non-integer multiplication ratio between the local oscillator and RF frequencies. The LO generation schemes presented are operative to generate I and Q square waves at a designated frequency while avoiding the well known issue of harmonic pulling. The signal is input to a synthesizer timed to a rational multiplier of the RF frequency fRF. The signal is then divided to generate a plurality of phases of the divided signal. A plurality of combination signals are generated which are then multiplied by a set of weights and summed to cancel out some undersired products. The result is filtered to generate the LO output signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.