This repository contains the KiCad design files for a low-noise photodetector. The detector consists of a standard silicon photodiode (Osram SFH203) in combination with a two-stage low-noise transimpedance amplifier. The PCB is fitted in a small outline case also provided in this repository.
- TIA-gain: 50 kΩ
- Sensitivity: 31 V/mW at 800 nm (29 V/mW at 850 nm for SFH203-FA)
- Max. output voltage: 10 V
- Small-signal bandwidth: 8 MHz (rise time: 42 ns)
- Max. slew rate: 50 V/µs
- Input referred noise: <3 pA/√Hz (NEP: 5 pW/√Hz at 800 nm)
- Power supply: ±12.5 V to ±20 V (±40 mA typ.)
Let your PCB-manufacturer assemble all parts. The design files can be found on the releases page and include the following resources:
- Schematics as a PDF
- Gerber files
- Pick & place position files
- Bill of materials as a CSV file and also as an interactive HTML version
The latest revision of those files can be found here.
Use the provided step-files for 3D-printing the case with a conductive filament (e.g. ProtoPasta Conductive PLA). Threads are added by applying standard inserts. See \case folder and assembly document for details.
The case is designed for use with a fixed cable held by a clamping screw. The cable is internally connected to the JST connector J1. The other connector can be customized.
Recommended cable configuration with DIN 41 524 receptacle
Cable: 3x AWG24-AWG26, shielded, outer diameter 5.5mm max., length 50cm
Connector side 1: 3x JST BPH-002T-P0.5S, dangling 22mm (without contact)
Connector side 2: DIN 41524, 5-pole, 180°, receptacle
| Pin | Signal | Color |
|---|---|---|
| 1 | V- | Preferably blue |
| 2 | GND | Always black |
| 3 | V+ | Always red |
| 4 | NC | - |
| 5 | NC | - |
| Shell | Shield | - |
T. Preuschoff, Laser Technologies for Applications in Quantum Information Science, Ph.D. thesis, TU Darmstadt, 2023, https://tuprints.ulb.tu-darmstadt.de/23242/
This work is released under the CERN OHL v.1.2 See www.ohwr.org/licenses/cern-ohl/v1.2 or the included LICENSE file for more information.