SMU is used for SNSPD to:
- Determine switching current (Typically around 3μA) by hysteresis V-I sweep measurement
- Source steady biasing current to the nano-wire
However, the commercial SMU are typically single channel, and large sweep range is unnecessary for SNSPD.
This PCB provides necessary features for SNSPD biasing with 4 channels at around 300CAD per assembled PCB.
- 4 channels independently controlled from Python Remi GUI
- 10nA measurement precision
- Hysteresis V-I sweep with controllable range (maximum ± 1.0 V) and step size
- With 100kΩ resistor down steam, current will be around 10μA at 1.0 V
- Measurements plotted on GUI and also recorded as an txt file
- Steady biasing current sourcing at set voltage
- Per-channel current sense calibration
- Per-channel ODR settings
- Assembled PCB
- 9V / 1A Power Adapter (Current output higher than 1A is also fine)
- Micro USB cable
- Computer
- 100kΩ Resistor
- Electrometer (Only for initial calibration)
Firmware developed by Taichi Kamei and PCB designed by Avi Guha, with contributions by: Mateo Branion-Calles, Adan Azem
Requires installation of uv Python package and project manager
PCB
Channel IDs
Electrometer comparison measurement
100k Ohm downstream resistor