Evaluation of a front-end ASIC for the readout of PMTs over a large dynamic range

WU Wei-Hao; ZHAO Lei; LIANG Yu; YU Li; LIU Jian-Feng; LIU Shu-Bin; AN Qi

doi:10.1088/1674-1137/39/12/126101

Chinese Physics C> 2015, Vol. 39> Issue(12) : 126101 DOI: 10.1088/1674-1137/39/12/126101

Evaluation of a front-end ASIC for the readout of PMTs over a large dynamic range

1.
State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei 230026, China

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Abstract：
The Large High Altitude Air Shower Observatory (LHAASO) project has been proposed for the survey and study of cosmic rays. In the LHAASO project, the Water Cherenkov Detector Array (WCDA) is one of the major detectors for searching for gamma ray sources. A Charge-to-Time Convertor (QTC) ASIC (Application Specification Integrated Circuit), fabricated with Global Foundry 0.35 μm CMOS technology, has been developed for readout of photomultiplier tubes (PMTs) in the WCDA. This ASIC provides both time and charge measurement of PMT signals. The input charge is converted to a pulse width based on the Time-Over-Threshold (TOT) technique and linear discharge method; as for time measurement, leading edge discrimination is employed. This paper focuses on the evaluation of this front-end readout ASIC performance. Test results indicate that the time resolution is better than 400 ps and the charge resolution is better than 1% with large input signals and remains better than 15% @ 1 photoelectron (P.E.), both beyond the application requirement. Moreover, this ASIC has a weak ambient temperature dependence, low input rate dependence and high channel-to-channel isolation.
- ASIC ,
- time measurement ,
- charge measurement ,
- QTC ,
- LHAASO ,
- WCDA

References

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WU Wei-Hao, ZHAO Lei, LIANG Yu, YU Li, LIU Jian-Feng, LIU Shu-Bin and AN Qi. Evaluation of a front-end ASIC for the readout of PMTs over a large dynamic range[J]. Chinese Physics C, 2015, 39(12): 126101. doi: 10.1088/1674-1137/39/12/126101

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Received: 2015-02-06
Revised: 2015-05-21

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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Evaluation of a front-end ASIC for the readout of PMTs over a large dynamic range

Corresponding author: WU Wei-Hao,

1. State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei 230026, China

Received Date: 2015-02-06

Accepted Date: 2015-05-21

Available Online: 2015-12-20

Abstract: The Large High Altitude Air Shower Observatory (LHAASO) project has been proposed for the survey and study of cosmic rays. In the LHAASO project, the Water Cherenkov Detector Array (WCDA) is one of the major detectors for searching for gamma ray sources. A Charge-to-Time Convertor (QTC) ASIC (Application Specification Integrated Circuit), fabricated with Global Foundry 0.35 μm CMOS technology, has been developed for readout of photomultiplier tubes (PMTs) in the WCDA. This ASIC provides both time and charge measurement of PMT signals. The input charge is converted to a pulse width based on the Time-Over-Threshold (TOT) technique and linear discharge method; as for time measurement, leading edge discrimination is employed. This paper focuses on the evaluation of this front-end readout ASIC performance. Test results indicate that the time resolution is better than 400 ps and the charge resolution is better than 1% with large input signals and remains better than 15% @ 1 photoelectron (P.E.), both beyond the application requirement. Moreover, this ASIC has a weak ambient temperature dependence, low input rate dependence and high channel-to-channel isolation.

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Evaluation of a front-end ASIC for the readout of PMTs over a large dynamic range

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