A digital-to-RF converter architecture suitable for a digital-to-RF direct-conversion software defined radio transmitter

An architecture for a digital-to-RF converter For a software defined radio (SDR) transmitter is proposed. The ideal hardware architecture for an SDR i s a digital-signal to RF-signal direct conversion transmitter. However no c onventional digital-to-analog converter (DAC) lias converted over 1-GHz RF signal with enough resolution, in the present condition. In this paper, a d igital-to-RF direct converter architecture using a Delta Sigma modulation t echnique is proposed for the amplitude-phase modulated signal. The experime ntal results show that the proposed direct converter outputs a sufficiently accurate signal.