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Journal of Electrical and Computer Engineering
Volume 2017 (2017), Article ID 1658695, 10 pages
Research Article

A New Digital to Analog Converter Based on Low-Offset Bandgap Reference

School of Aeronautics and Astronautics, Zhejiang University, No. 38 Zheda Road, Hangzhou 310027, China

Correspondence should be addressed to Yongheng Shang

Received 12 July 2016; Accepted 13 December 2016; Published 2 January 2017

Academic Editor: Muhammad Taher Abuelma’atti

Copyright © 2017 Jinpeng Qiu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This paper presents a new 12-bit digital to analog converter (DAC) circuit based on a low-offset bandgap reference (BGR) circuit with two cascade transistor structure and two self-contained feedback low-offset operational amplifiers to reduce the effects of offset operational amplifier voltage effect on the reference voltage, PMOS current-mirror mismatch, and its channel modulation. A Start-Up circuit with self-bias current architecture and multipoint voltage monitoring is employed to keep the BGR circuit working properly. Finally, a dual-resistor ladder DAC-Core circuit is used to generate an accuracy DAC output signal to the buffer operational amplifier. The proposed circuit was fabricated in CSMC 0.5 μm 5 V 1P4M process. The measured differential nonlinearity (DNL) of the output voltages is less than 0.45 LSB and integral nonlinearity (INL) less than 1.5 LSB at room temperature, consuming only 3.5 mW from a 5 V supply voltage. The DNL and INL at −55°C and 125°C are presented as well together with the discussion of possibility of improving the DNL and INL accuracy in future design.