A 4-channel 8-bit 650-MSample/s DAC with interpolation filter for embedded application

This paper presents a 4-channel 8-bit 6-2 segmented current-steering digital-to-analog converter implemented in 0.13µm CMOS process. For the consideration of embedded application two-times interpolation filter with 4 channels' parallel inputs is added to the DAC input block. Besides, the DAC system is also optimized for a good high-frequency performance. An improved swing reduction circuit is proposed to decrease the digital signal feed-through to the output. The double centroid current array layout is also used to avoid systemic and graded errors. The measured results show that the DAC achieves over 50dB SFDR at 61MHz input and over 41dB at Nyquist input under a sampling rate of 650MS/s at power consumption of 18mW from a 1.2 V power supply.