Method and apparatus for analog-to-digital conversion
US7373119B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 7, 2002 |
| Grant date | May 13, 2008 |
| Priority date | — |
| Expiry date | Mar 19, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/1255
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The present invention eliminates the need for an anti-aliasing filter in a receiver that employs an analog-to-digital converter. By maintaining a predetermined relationship between a local oscillator frequency and the sampling frequency of the analog-to-digital converter, aliasing that would normally occur in the desired pass band is avoided. More specifically, the frequency of the periodic signal provided to the mixer is an integer multiple of half the sampling rate of the analog-to-digital converter. In a preferred, non-limiting example embodiment, the sampling rate of the analog-to-digital converter FADC and the frequency of the local oscillator FLO are related by the following: FLO=n*FADC/2, where n is any positive integer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.