A compact, 96-ch, multi-functional and practical front-end readout electronics system for a SiPM based PET detector is developed. This electronics system is based on the latest Sigma Delta Modulation (SDM) circuit, which implements a charge-to-digital conversion (QDC) that keeps energy, timing information. In order to achieve a compact size, the system has a stacked structure including two kinds of boards, analog board and digital board. The analog board is responsible for charge integration of SDM while the digital board is for discharging feedback of the SDM circuit. Also, the digital board is applied for energy calculation, timing pickoff and data buffering and transferring. In comparison to the initial version of the SDM QDC, the input signal polarity on the electronics system is improved from negative only to both positive and negative polarities so that it can process both SiPM anode and cathode signals. Several SiPM based PET detectors are applied to validate the capability of dual polarity readout and multi-functionality. Overall, the prototype electronics system demonstrated its good performance for PET application.

开发了一种用于基于 SiPM 的 PET 检测器的紧凑型、96 通道、多功能和实用的前端读出电子系统。该电子系统基于最新的 Sigma Delta 调制 (SDM) 电路，该电路实现了电荷数字转换 (QDC)，可保持能量和时序信息。为了实现紧凑的尺寸，系统采用堆叠结构，包括两种板卡，模拟板和数字板。模拟板负责SDM 的电荷积分，而数字板负责SDM 电路的放电反馈。此外，数字板还用于能量计算、定时拾取和数据缓冲和传输。与 SDM QDC 的初始版本相比，电子系统上的输入信号极性从仅负极性改进为正极性和负极性，以便它可以处理 SiPM 阳极和阴极信号。几个基于 SiPM 的 PET 检测器被应用于验证双极性读出和多功能的能力。总体而言，原型电子系统展示了其在 PET 应用中的良好性能。