一种可校准的低温漂基准电流源

doi:10.3969/j.issn.1001-2400.2013.04.022

J4 ›› 2013, Vol. 40 ›› Issue (4): 130-136.doi: 10.3969/j.issn.1001-2400.2013.04.022

一种可校准的低温漂基准电流源

汤华莲;庄奕琪;张丽;景鑫;杜永乾

(西安电子科技大学宽禁带半导体材料与器件教育部重点实验室，陕西西安 710071)

收稿日期:2012-05-09 出版日期:2013-08-20 发布日期:2013-10-10
通讯作者: 汤华莲
作者简介:汤华莲(1977-)，女，西安电子科技大学博士研究生，E-mail: lily_thl@126.com．
基金资助:
国家重大科技专项资助项目(2010ZX03002-001-02)；中央高校基本科研业务费资助项目(K50511250006)

Design of a trimmed current reference with a low temperature drift

TANG Hualian;ZHUANG Yiqi;ZHANG Li;JING Xin;DU Yongqian

(Ministry of Education Key Lab. of Wide Band-Gap Semiconductor Materials and Devices, Xidian Univ., Xi'an 710071， China)

Received:2012-05-09 Online:2013-08-20 Published:2013-10-10
Contact: TANG Hualian

摘要/Abstract

摘要：

针对由于工艺偏差导致的器件误差和不匹配性会严重降低基准源的性能，在研究器件失配的基础上，设计了幅值在15～80μA之间可调的基准电流源I_ref，同时利用温度补偿电路来提高其温度特性．为了进一步提高基准源的精度，提出了一个双向校准电路，它由8bit的外部信号控制校准电流的方向及大小，并采用二进制加权的编码方式实现127级的等比数列电流校准．基于CMOS 0.13μm工艺，在输出电流为15μA，温度范围为-40℃～120℃的仿真条件下，基准电流温度系数为26ppm/℃．实测结果表明，电流源校正范围为-14.3％·I_ref～14.3％·I_ref，校正精度为0.11％·I_ref，可应用在高精度的A/D和D/A转换器等集成电路中．

关键词: 基准电流, 温度系数, 工艺偏差, 校准

Abstract:

Component tolerances and mismatches due to process variations severely degrade the performance of bandgap reference circuits. Based on device mismatch models, a current reference I_ref with adjustable output current from 15μA to 80μA is designed. A compensated circuit is used to reduce the temperature drift. To achieve more accurate current reference, an 8bit bi-directional trimming array with 127 current levels is proposed. This digitally programmable array is binary weighted for accuracy and flexibility. Simulation shows that the temperature coefficient is 26ppm/℃ over the wide range of -40℃ to 120℃when the output current is 15μA. Based on the CMOS 0.13μm technology, the measurement results show that the trimmed range and precision for current reference are -14.3％·I_ref～14.3％·I_ref and 0.11％·I_ref, respectively. The circuit could be applied to high precision A/D and D/A converters.

Key words: current reference, temperature coefficient, process variations, trimming

中图分类号:

TN45

汤华莲;庄奕琪;张丽;景鑫;杜永乾. 一种可校准的低温漂基准电流源[J]. J4, 2013, 40(4): 130-136.

TANG Hualian;ZHUANG Yiqi;ZHANG Li;JING Xin;DU Yongqian. Design of a trimmed current reference with a low temperature drift[J]. J4, 2013, 40(4): 130-136.

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一种可校准的低温漂基准电流源

Design of a trimmed current reference with a low temperature drift

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