A 100-MHz CMOS DAC for video-graphic systems

A 6-b weighted-current-sink video digital-to-analog converter (DAC) with 10-90% rise/fall time of 4 ns, integrated with a double-metal 3-μm CMOS technology, is described. Current-source matching, glitch reduction, and differential switch driving aspects are considered. A circuit solution and a nonconventional layout technique yield a high conversion rate with a standard CMOS technology. Experimental results show that a conversion rate of 100 MHz is achievable. The power consumption is 150 mW and the active chip area is 0.5×1.0 mm² . The differential of 0.1 LSB demonstrates that 8 b of accuracy can be achieved. The integral linearity is 0.5 LSB