The following email has been sent to KANG, Dong-uk:
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Dear DONG-UK KANG,
The submission of your abstract has been successfully processed.
Abstract submitted: https://indico.cern.ch/userAbstracts.py?confId=192695.
Status of your abstract: https://indico.cern.ch/abstractDisplay.py?abstractId=62&confId=192695.
See below a detailed summary of your submitted abstract:
Conference: Tipp 2014 - Third International Conference on Technology and Instrumentation in Particle Physics
Submitted by: KANG, Dong-uk
Submitted on: 29 January 2014 03:34
Title: High-speed photon counting readout ASIC for spectral computed tomography detectors
Abstract content This study is concerned with the simulation and design of a high-speed photon counting readout circuit for spectral computed tomography detectors. We propose a novel front-end architecture aimed at reducing dead time by introducing multi signal paths in each pixel cell. A prototype chip using 0.18um six-metal standard CMOS process is consisting of 16 x 16 pixels. Each pixel has 200um pixel pitch and contains two signal paths. Two preamplifiers, eight comparators, three 15-bit counters, switching circuits, and a 30um x 30um input pad are included in a pixel. Each preamplifier has feedback capacitor and feedback resistor. We use a transistor as a feedback resistor to control its resistivity. When the preamplifier integrate charge from the input pad, the gate voltage of the transistor is lower than threshold voltage to have high resistivity. After readout the input current pulse, the transistor is turned on for fast reset. The two preamplifiers are connected to the input pad via the switching circuit respectively. The switching circuit allows only one preamplifier to connect the input pad at a time. After current pulse coming to one amplifier through the switching circuit, the switching circuit changes its connection to reduce dead time of a pixel. Each output of the two preamplifiers feed four comparators with different thresholds respectively. These four comparators perform quantization of the preamplifier output amplitude to distinguish incident X-ray photon energy. The chip will be fabricated in June 2014 and post layout simulation results will be presented in TIPP 2014.
Summary
Primary Authors: KANG, Dong-uk (KAIST) dukang@kaist.ac.kr
Co-authors: LEE, Daehee (KAIST) zzzeogml@kaist.ac.kr KIM, Myungsoo (KAIST) myungsoo@kaist.ac.kr CHO, Minsik (KAIST) robincho@kaist.ac.kr YOO, Hyunjun (KAIST) cmos@kaist.ac.kr PARK, Kyeongjin (KAIST) myesens@kaist.ac.kr LEE, Eunjoong (KAIST) leej0715@kaist.ac.kr Prof. KIM, Hyunduk (KAIST) oneman@kaist.ac.kr Prof. CHO, Gyuseong (KAIST) gscho@kaist.ac.kr
Abstract presenters: KANG, Dong-uk
Track classification: Sensors: 1d) Photon Detectors Data-processing: 3a) Front-end Electronics
Presentation type: --not specified--
Comments: TIPP 2014 is great opportunity for me to learn particle physics, especially photon counting detectors for X-ray. I'm really looking forward to meeting people who work in particle physics field.