开源实验室硬件：用于弱光检测的带直流偏移的低噪声可调两级增益跨阻放大器。

Open-source lab hardware: Low noise adjustable two-stage gain transimpedance amplifier with DC offset for low-light detection.

作者信息

Cretu Vlad F, Kehl Florian, Metz Brandon C, Willis Peter A

机构信息

NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA.

Innovation Cluster Space and Aviation (UZH Space Hub), Air Force Center, University of Zurich, 8600 Dübendorf, Switzerland.

出版信息

HardwareX. 2021 Sep 21;10:e00233. doi: 10.1016/j.ohx.2021.e00233. eCollection 2021 Oct.

DOI:10.1016/j.ohx.2021.e00233

PMID:35607697

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9123464/

Abstract

An open-source, low noise, low cost, and tunable transimpedance amplifier is presented. The compact circuit board requires few parts and costs less than $65 USD. The transimpedance amplifier is intended for low-light detection and operation with commercial photomultiplier tubes (PMTs). It provides a much more cost-effective acquisition tool compared to competitive products on the market. The system can easily be assembled and modified to suit specific current sensing applications. The amplifier features two variable gains and an adjustable DC offset to optimize dynamic range and suppress potential bias in the signal. With a target bandwidth of DC to 2 Hz and fourth-order Sallen-Key cutoff, the design is ideally suited for various applications in the field of analytical chemistry and biology, such as laser-induced fluorescence detection or chemiluminescence measurements.

摘要

本文介绍了一种开源、低噪声、低成本且可调的跨阻放大器。该紧凑型电路板所需部件少，成本低于65美元。该跨阻放大器旨在用于微光检测，并与商用光电倍增管（PMT）配合使用。与市场上的同类产品相比，它提供了一种更具成本效益的采集工具。该系统可以轻松组装和修改，以适应特定的电流传感应用。该放大器具有两个可变增益和一个可调直流偏移，以优化动态范围并抑制信号中的潜在偏置。其目标带宽为直流至2赫兹，采用四阶Sallen-Key截止，该设计非常适合分析化学和生物学领域的各种应用，如激光诱导荧光检测或化学发光测量。