A new front-end ASIC for GEM detectors with time and charge measurement capabilities

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• 作者：F. Ciciriello^a ; ^b ; ^{fabio.ciciriello@poliba.it" class="auth_mail" title="E-mail the corresponding author} ; F. Corsi^a ; ^b ; G. De Robertis^b ; G. Felici^c ; F. Loddo^b ; C. Marzocca^a ; ^b ; G. Matarrese^a ; ^b ; A. Ranieri^b
• 关键词：GEM ; Front-end electronics ; ASIC
• 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
• 出版年：2016
• 出版时间：11 July 2016
• 年：2016
• 卷：824
• 期：Complete
• 页码：265-267
• 全文大小：961 K

文摘

A 32 channel CMOS front-end ASIC has been designed to read out the GEM detectors intended to be used for beam monitoring in a new proton-therapy facility currently under construction. In order to improve the spatial resolution by exploiting charge centroid algorithms, the analog channels, based on the classic CSA+shaper architecture, are equipped with a peak detector (PD) which works as an analog memory during the read-out phase. The outputs of the PDs are multiplexed towards an integrated 8-bit subranging ADC. An accurate trigger signal marks the arrival of a valid event and is generated by fast-ORing the outputs of 32 voltage discriminators which compare the shaper outputs with a programmable threshold. The digital part of the ASIC manages the read-out of the channels, the A/D conversion and the configuration of the ASIC. A 100 Mbit/s LVDS serial link is used for data communication. The sensitivity of the analog channel is 15 mV/fC and the dynamic range is 80 fC. The simulated ENC is about 650 e⁻ for a detector capacitance of 10 pF. © 2001 Elsevier Science. All rights reserved