A 90nm 10-bit 1 GS/s current-steering DAC with 1-V supply voltage

This paper discusses the design of a 90 nm CMOS 1V 10-bit 1GS/s current-steering D/A converter. The proposed design operates under low supply voltage of 1V and gives a large differential full-scale output of 0.5 V-ppd. A wide full-scale current range of 2-10mA is designed and the output impedance of the DAC is optimized for different full-scale currents by a bias circuit related to them. The post-layout simulation results show that the SFDR and ENOB are 50.64dBc and 7.86 bit respectively with a full-scale 308.59MHz input at 1GS/s and more than 50 dB and 8 bit respectively when the signal bandwidth is less than 200MHz. The converter consumes a total power of 23mW at 1 V supply. It is designed for 90 nm CMOS technology and has an active area of 0.47 mm(2).