A Configurable Ultra-Low Noise Current Source for Transition-Edge Sensor Characterization
Journal of Instrumentation(2023)
摘要
Transition-edge sensors (TESs) are sensitive devices for detecting photons
from millimeter radiation to gamma rays. Their photon counting efficiency and
collecting area benefit from large-array multiplexing scheme, and therefore the
development of multiplexing readout system has been an important topic in this
field. Among the many multiplex techniques, time-division multiplexing (TDM)
superconducting quantum interference device (SQUID) has been used most widely
for TES readout. In this work, we design a Configurable Ultra-Low Noise Current
Source (CLCS) for TES characterization and as a part of a whole TDM-TES bias
control system. The CLCS is based on the feedback structure of ultra-low noise
instrumentation amplifiers and low-noise, high-resolution (20 bits)
digital-to-analog converter (DAC). CLCS has an ultra-high resolution of 10 nA
in the 0 to 5 mA current output range, and can perform current-voltage (IV)
sweep and bias-step tests to measure key TES parameters on board. The feedback
structure of the CLCS also avoids the issue of impedance mismatch.
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