Onboard calibration circuit for the DAMPE BGO calorimeter front-end electronics
Onboard calibration circuit for the DAMPE BGO calorimeter front-end electronics
复制标题
DAMPE BGO 热量计前端电子设备的板载校准电路
DOI：
10.1088/1674-1137/40/5/056101
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发表时间：
2016-01
影响因子：
3.6
通讯作者：
An, Qi
中科院分区：
文献类型：
--
作者：
Zhang, Yun-Long;Guo, Jian-Hua;Liu, Shu-Bin;An, Qi
DAMPE（Dark Matter Particle Explorer）是一颗科学卫星，主要用于间接寻找太空中的暗物质。DAMPE有效载荷的一个关键子探测器是BGO（铋锗氧化物）量热计，它包含1848个PMT（光电倍增管）倍增管电极和16个FEE（前端电子）板。采用VA 160和VATA 160这两个32通道低功耗专用集成电路作为光电倍增管电荷测量的关键器件。为了监测可能由温度变化、老化或其他环境因素引起的参数漂移，为VA 160和VATA 160 ASIC设计了板载校准电路。它主要由一个12位DAC（数模转换器）、一个运算放大器和一个模拟开关组成。测试结果表明，该传感器的动态范围为0-30 pC，测量精度为5 fC（均方根），覆盖了VA 160的输入范围。它可以用来补偿温度漂移和测试的触发功能的FEE。该校准电路已用于BGO量热计的前端电子学，并通过DAMPE鉴定模型和飞行模型的所有环境试验进行了验证。DAMPE卫星于2015年底发射，校准电路将定期在太空中运行。
DAMPE(DArk Matter Particle Explorer) is a scientific satellite which is mainly aimed at indirectly searching for dark matter in space. One critical sub-detector of the DAMPE payload is the BGO(bismuth germanium oxide) calorimeter, which contains 1848 PMT(photomultiplier tube) dynodes and 16 FEE(Front-End Electronics)boards. VA160 and VATA160, two 32-channel low power ASICs(Application Specific Integrated Circuits), are adopted as the key components on the FEEs to perform charge measurement for the PMT signals. In order to monitor the parameter drift which may be caused by temperature variation, aging, or other environmental factors,an onboard calibration circuit is designed for the VA160 and VATA160 ASICs. It is mainly composed of a 12-bit DAC(Digital to Analog Converter), an operational amplifier and an analog switch. Test results showed that a dynamic range of 0–30 p C with a precision of 5 f C(Root Meam Square, RMS) was achieved, which covers the VA160’s input range. It can be used to compensate for the temperature drift and test the trigger function of the FEEs. The calibration circuit has been implemented for the front-end electronics of the BGO Calorimeter and verified by all the environmental tests for both Qualification Model and Flight Model of DAMPE. The DAMPE satellite was launched at the end of 2015 and the calibration circuit will operate periodically in space.