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

摘要

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.