Generation of virtual local oscillator inputs for use in direct conversion radio systems
US6727764B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 8, 2002 |
| Grant date | Apr 27, 2004 |
| Priority date | — |
| Expiry date | Mar 8, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03J2200/17
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The invention provides a system and method of generating a number of inputs to the mixer elements in a direct conversion (homodyne) receiver configuration using Virtual Local Oscillator (VLO) techniques. These generated inputs meet the requirement that they must have a fixed and stable phase-relationship, as well as being correctly related in terms of their power spectra relative to the operating radio (RF), intermediate (IF), and baseband frequencies of the system, and that when applied to the mixer elements they permit the mixer elements to create internally the effect of applying the Local Oscillator signal at a suitable frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.