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Open-source lab hardware: Low noise adjustable two-stage gain transimpedance amplifier with DC offset for low-light
Vlad F Cretu1, Florian Kehl1,2,3,4, Brandon C Metz1
1NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA.
Hardwarex
|May 24, 2022
Summary
This study presents a low-cost, open-source transimpedance amplifier for low-light detection using photomultiplier tubes (PMTs). The tunable, compact design offers a cost-effective solution for analytical chemistry and biology applications.
Area of Science:
- Electronics
- Instrumentation
- Analytical Chemistry
Background:
- Commercial transimpedance amplifiers are often expensive.
- Low-light detection requires sensitive and precise amplification.
- Photomultiplier tubes (PMTs) are common detectors for low light levels.
Purpose of the Study:
- To develop an open-source, low-cost, and tunable transimpedance amplifier.
- To provide a cost-effective alternative for low-light detection with PMTs.
- To enable flexible current sensing applications in analytical chemistry and biology.
Main Methods:
- Designed a compact circuit board with few components (<$65 USD).
- Incorporated two variable gains and an adjustable DC offset.
- Implemented a fourth-order Sallen-Key filter with a target bandwidth of DC to 2 Hz.
Main Results:
- Achieved a low-noise and tunable transimpedance amplifier.
- Demonstrated a cost-effective solution compared to commercial products.
- The design is suitable for integration into various analytical instruments.
Conclusions:
- The presented transimpedance amplifier is a versatile and affordable tool for low-light measurements.
- Its open-source nature and modular design facilitate customization.
- Ideal for applications like laser-induced fluorescence and chemiluminescence detection.
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