document: A digital-to-analog converter based on differential-quad switching A high-conversion-rate high-resolution oversampling digital-to-analog converter -LRB- DAC -RRB- for direct digital modulation is addressed in this paper . A new type of switching scheme , called differential-quad switching , is presented . To verify the feasibility of this scheme , essential parts with some auxiliary circuitry for interfacing were fabricated in a 0.8 - mu m CMOS technology . Measured results show that the switching scheme provides 11-b resolution at 100 MSamples/s and 6-b at 1 GSamples/s . The degradation in signal-to-noise ratio is not observed for the variation of the supply voltage down to 1.5 V , which means the proposed scheme is suitable for low-voltage applications
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