A Low-Power, High-Resolution Analog Front-End Circuit for Carbon-Based SWIR Photodetector

IF 2.6 3区工程技术 Q2 COMPUTER SCIENCE, INFORMATION SYSTEMS

Electronics Pub Date : 2024-09-18 DOI:10.3390/electronics13183708

Yuyan Zhang, Zhifeng Chen, Wenli Liao, Weirong Xi, Chengying Chen, Jianhua Jiang

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引用次数: 0

Abstract

Carbon nanotube field-effect transistors (CNT-FETs) have shown great promise in infrared image detection due to their high mobility, low cost, and compatibility with silicon-based technologies. This paper presents the design and simulation of a column-level analog front-end (AFE) circuit tailored for carbon-based short-wave infrared (SWIR) photodetectors. The AFE integrates a Capacitor Trans-impedance Amplifier (CTIA) for current-to-voltage conversion, coupled with Correlated Double Sampling (CDS) for noise reduction and operational amplifier offset suppression. A 10-bit/125 kHz Successive Approximation analog-to-digital converter (SAR ADC) completes the signal processing chain, achieving rail-to-rail input/output with minimized component count. Fabricated using 0.18 μm CMOS technology, the AFE demonstrates a high signal-to-noise ratio (SNR) of 59.27 dB and an Effective Number of Bits (ENOB) of 9.35, with a detectable current range from 500 pA to 100.5 nA and a total power consumption of 7.5 mW. These results confirm the suitability of the proposed AFE for high-precision, low-power SWIR detection systems, with potential applications in medical imaging, night vision, and autonomous driving systems.

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用于碳基 SWIR 光电探测器的低功耗、高分辨率模拟前端电路

碳纳米管场效应晶体管（CNT-FET）因其高迁移率、低成本以及与硅基技术的兼容性，在红外图像检测领域大有可为。本文介绍了专为碳基短波红外（SWIR）光电探测器定制的列级模拟前端（AFE）电路的设计和仿真。该模拟前端电路集成了一个电容跨阻放大器（CTIA），用于电流到电压的转换，并采用相关双采样（CDS）技术降低噪声和抑制运算放大器偏移。10 位/125 kHz 逐次逼近模数转换器（SAR ADC）完善了信号处理链，以最少的元件数量实现了轨至轨输入/输出。AFE 采用 0.18 μm CMOS 技术制造，信噪比 (SNR) 高达 59.27 dB，有效位数 (ENOB) 为 9.35，检测电流范围为 500 pA 至 100.5 nA，总功耗为 7.5 mW。这些结果证实了所提出的 AFE 适用于高精度、低功耗的 SWIR 检测系统，有望应用于医疗成像、夜视和自动驾驶系统。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Electronics Computer Science-Computer Networks and Communications

CiteScore

1.10

自引率

10.30%

发文量

3515

审稿时长

16.71 days

期刊介绍： Electronics (ISSN 2079-9292; CODEN: ELECGJ) is an international, open access journal on the science of electronics and its applications published quarterly online by MDPI.