A CMOS Frontend for Scintillators Readout by Photodiodes for Nuclear Physics Experiments

作者：Castoldi A; Guazzoni C^*; Parsani T

来源：IEEE Transactions on Nuclear Science, 2017, 64(10): 2678-2682.

DOI：10.1109/TNS.2017.2741962

• Charged particle identification
• scintillation detectors
• very large-scale integration (VLSI) charge preamplifier (CPA)

We designed a CMOS frontend for the readout of scintillators coupled with silicon photodiodes for nuclear physics experiments. The preamplifier features a continuous-reset feedback and an input pMOS transistor. The designed input dynamic range is 90-MeV silicon equivalent. The frontend has been integrated in single channel and multichannel versions up to 16-channel application specific integrated circuits (ASICs) in the C35B4C3 AMS technology. The measured integral-non-linearity over the whole dynamic range is below 0.5%. The intrinsic rise time (10%-90%) of the preamplifier is of the order of 3 ns over the entire dynamic range and is below 50 ns when coupled with a 130-pF photodiode. We qualified the spectroscopic performance by acquiring spectra of a mixed nuclei alpha source and of different gamma sources (Cs-137 and Co-60) with a CsI(Tl) scintillator crystal 3.2 cmx 3.2 cmx6 cm coupled with a 18 mmx 18 mm silicon p-i-n diode 300-mu m-thick readout by the developed ASIC.

• 出版日期2017-10