Abstract
This brief presents a dual-rate dual-mode power digital-to-analog converter (DAC) circuit to cover wide range of supply voltages. For various applications, it is designed to have dual conversion rate of Nyquist and oversampling in conventional current-steering DACs, and its output stage is implemented to support two kind modes of high-voltage and low-voltage. To achieve optimal performance of spurious-free dynamic range, the output swing is adaptively maximized depending on supply voltage levels. For feasibility of the proposed supply-scalable dual-rate dual-mode structure, a power DAC prototype is fabricated in a 0.18 mm bipolar CMOS DMOS process, and experimentally verified to provide normalized power efficiency of 81.5%.
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