Local oscillator with non-harmonic ratio between oscillator and RF frequencies using XOR operation with jitter estimation and correction
US7778610B2 · kind B2 · utility
18Cited by
6References
31Claims
0Family size
Assignee
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Key dates
| Filing date | Aug 24, 2007 |
| Grant date | Aug 17, 2010 |
| Priority date | — |
| Expiry date | Feb 13, 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 use of analog mixers of the prior art is avoided and replaced with an XOR gate configured to generate the correct average frequency. The edges are dynamically adjusted by ±T/12 or zero based on the state of the controlled oscillator down-divided clock.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.