Digitally supported feed-forward harmonic cancellation for filter-less ultra-wideband transmitters

The ultra-wideband (UWB) transmitters require bulky filter-banks to suppress harmonics at power amplifier (PA) output. This paper presents a digitally supported feed-forward (DSFF) harmonic cancellation scheme to allow re-configurability in terms of frequency and compact size. The proposed scheme is implemented in a low cost FPGA based measurement setup suitable for base-stations. As a case study, cancellation of second harmonic signal with 27 dBc adjacent channel power ratio is reported.

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