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A 12-bit,100-MHz CMOS current-steering D/A converter for CNC(computer number control) systems is presented.To reduce the glitch and increase the SFDR(spurious-free dynamic range),a low crosspoint switch driver and a special dummy switch are applied.In addition,a 4-5-3 segmental structure is used to optimize the performance and layout area.After improvement,the biggest glitch energy decreased from 6.7 pVs to 1.7 pVs,the INL decreased from 2 LSB to 0.8 LSB,the SFDR is 78 dB at a 100-MSPS clock rate and 1 MHz output frequency. This DAC can deliver up to 20.8 mA full-scale current into a 50Ωload.The power when operating at full-scale current is 163 mW.The layout area is 1.8×1.8 mm~2 in a standard 0.35-μm CMOS technology.
A 12-bit, 100-MHz CMOS current-steering D / A converter for CNC (computer number control) systems is presented.To reduce the glitch and increase the SFDR (spurious-free dynamic range), a low crosspoint switch driver and a special dummy switch are applied. In addition, a 4-5-3 segmental structure is used to optimize the performance and layout area. After improvement, the biggest glitch energy decreased from 6.7 pVs to 1.7 pVs, the INL decreased from 2 LSB to 0.8 LSB, the SFDR is 78 dB at a 100-MSPS clock rate and 1 MHz output frequency. This DAC can deliver up to 20.8 mA full-scale current into a 50 Ω load. The power when operating at full-scale current is 163 mW. Layout area is 1.8 × 1.8 mm ~ 2 in a standard 0.35-μm CMOS technology.