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A parallel architecture for a direct digital-to-RF digital-to-analogue converter (DDRF-DAC) is proposed for digital radio transmitters. Multiple paths of wide-bandwidth DACs are used, each fed with interleaved signal samples and each sampled at interleaved time instants. This results in the cancellation of the first N-1 replica images and the first N-1 nonlinearity spurs, thus allowing for wideband operation.
Date of Publication: July 2010