一种多通道R-βR梯形dac的原位数字背景标定算法

Liangjian Lyu, Qingzhen Wang, Zepeng Huang, Xing Wu
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引用次数: 1

摘要

R-2R电阻阶梯是在植入式神经刺激器中实现紧凑型数模转换器(DAC)阵列的最佳拓扑之一。然而,由于组件不匹配,它具有有限的分辨率和相当大的通道间变化。为了避免模拟信息的丢失,本文提出了一种由R-βR电阻阶梯实现的亚基-2 DAC。数字逐次逼近寄存器(DSAR)算法根据dac的实际位权对其传递函数进行校正。此外,一种低成本的原位自适应位权校准(ABC)算法通过自动调整两个dac的位权来驱动它们之间的模拟输出误差为零。仿真结果表明,该算法能够在后台标定各DAC的非线性传递函数和多通道间的增益误差。
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An in situ digital background calibration algorithm for multi-channel R-βR ladder DACs

The R-2R resistor ladder is one of the best topologies for implementing compact-sized digital-to-analog converter (DAC) arrays in implantable neuro-stimulators. However, it has a limited resolution and considerable inter-channel variation due to component mismatches. To avoid losing analog information, we present sub-radix-2 DAC implemented by the R-βR resistor ladder in this paper. The digital successive approximation register (DSAR) algorithm corrects the transfer function of DACs based on their actual bit weights. Furthermore, a low-cost in situ adaptive bit-weight calibration (ABC) algorithm drives the analog output error between two DACs to zero by adjusting their bit weights automatically. The simulation results show that the proposed algorithm can calibrate the non-linear transfer function of each DAC and the gain error among multiple channels in the background.

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来源期刊
Journal of Electronic Science and Technology
Journal of Electronic Science and Technology Engineering-Electrical and Electronic Engineering
CiteScore
4.30
自引率
0.00%
发文量
1362
审稿时长
99 days
期刊介绍: JEST (International) covers the state-of-the-art achievements in electronic science and technology, including the most highlight areas: ¨ Communication Technology ¨ Computer Science and Information Technology ¨ Information and Network Security ¨ Bioelectronics and Biomedicine ¨ Neural Networks and Intelligent Systems ¨ Electronic Systems and Array Processing ¨ Optoelectronic and Photonic Technologies ¨ Electronic Materials and Devices ¨ Sensing and Measurement ¨ Signal Processing and Image Processing JEST (International) is dedicated to building an open, high-level academic journal supported by researchers, professionals, and academicians. The Journal has been fully indexed by Ei INSPEC and has published, with great honor, the contributions from more than 20 countries and regions in the world.
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