期刊
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS
卷 61, 期 3, 页码 725-735出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TCSI.2013.2283992
关键词
Amplifiers; noise analysis; positron emission tomography; radiation detectors; silicon photo-multiplier; transimpedance amplifiers
资金
- FCT-Portuguese Foundation for Science and Technology [PEst-OE/EEL/LA0021/2013, PEst-OE/EEI/UI0066/2011, IMPETO (EXPL/EEI.ELC/1294/2013), DISRUPTIVE (EXCL/EEI-ELC/0261/2012)]
A transimpedance amplifier (TIA) in the front-end of a radiation detector is required to convert the current pulse produced by a light-detector to a voltage pulse with amplitude and shape suitable for the subsequent processing. We consider in this paper the specifications of a positron emission tomography (PET) scanner for medical imaging. The conventional approach is to use an avalanche photo-diode (APD) as the light-detector and a feedback TIA. We point out here that, when the APD is replaced by the more recent silicon photo-multiplier (SiPM), a feedback TIA is not suitable, and we propose the use of a regulated common-gate (RC-G) TIA. We derive the transimpedance function of the RC-G TIA considering the parasitic capacitances that have a dominant effect on the pulse shaping. We use the result obtained to establish TIA design guidelines, and we show that these should be different with an APD and with a SiPM at the input. We identify the dominant noise source in the RC-G TIA, and we derive a closed form equation for the output noise rms voltage. A prototype TIA was designed for UMC 130 nm CMOS technology. We present simulation and experimental results that confirm that the RC-G circuit is suitable for implementation of the TIAs in the front-end of a PET scanner using SiPMs at the input.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据