A Fully Integrated Current-Steering 10-b CMOS D/A Converter with a Self-Calibrated Current Bias Circuit

摘要

A fully integrated current-steering 10-b CMOS Digital-to-Analog Converter with internal termination resistors is presented. In order to improve the device-mismatching problem of internal termination resistors, a self-calibrated current bias circuit is designed. With the self-calibrated current bias circuit, the gain error of the output voltage swing is reduced within 0.5%. For the purpose of reducing glitch noises, further, a novel current switch based on a deglitching circuit is proposed. The prototype circuit has been fabricated with a 3 V 0.35 μm 2-poly 3-metal CMOS technology, and it occupies 1350 × 750μm silicon area with 45 mW power consumption. The measured INL and DNL are within 0.5 LSB, respectively. The measured SFDR is about 65 dB, when an input signal is about 8 MHz at 100 MHz clock frequency.