Up-conversion mechanism employing side lobe-selective pre-distortion filter and frequency replica-selecting bandpass filter respectively installed upstream and downstream of digital-to-analog converter
US5930301A · kind A · utility
80Cited by
10References
19Claims
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Key dates
| Filing date | Jun 25, 1996 |
| Grant date | Jul 27, 1999 |
| Priority date | — |
| Expiry date | Jun 25, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03C3/403
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An up-converter for digitally sampled baseband signals takes advantage of the sinc(x) spectral replication functionality of a DAC, using a post-DAC, band pass filter to isolate a baseband replica that falls within that sidelobe of the DAC's sinc(x) frequency response containing the desired IF. The parameters of a pre-compensation filter and the gain of a post DAC amplifier are set to compensate for the distortion and attenuation imparted by the DAC's sinc(x) frequency response.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.