论文标题
用于原型Si-Wem量热计的宽秋千电荷敏感放大器
A wide swing charge sensitive amplifier for a prototype Si-W EM calorimeter
论文作者
论文摘要
作为原型硅钨（SI-W）的电磁（EM）热量计，已经开发了宽阔的摇摆电荷敏感放大器（CSA），作为前端电子（费用）ASIC的一部分。 CSA使用5V MOS晶体管以0.35 $ $ M n-well CMOS技术设计，其线性工作范围为2.6 pc w.r.r.t输入电荷，功率耗散为2.3 mW。已经达到了噪声数（ENC）为820 E $^ - $在0 pf的检测器电容，噪声斜率为25 E $^ - $/pf（随后是CR-RC $^2 $ filter时，1.2 $ $ $ s的峰值峰值）。当连接到40 pf电容的硅检测器时，这种CSA的设计提供了79 dB的动态范围（最大可检测信号与噪声底的比率）为79 dB，最大输入电荷为2.6 pc。将基于折叠的cascode架构架构阶段和低压高摆电后视镜作为负载，当将输出节点偏向一个电源导轨时，CSA提供了扩大的输出摆动，并利用电压范围向相反的导轨。设计理念适用于大型输入信号的两个极性。本文介绍了CSA的设计，具有广泛的负输出摆动，以使用已知的检测器偏置方案在目标应用中的预期输入信号。
A wide swing charge sensitive amplifier (CSA) has been developed, as a part of a front-end electronics (FEE) readout ASIC, for a prototype silicon tungsten (Si-W) based electromagnetic (EM) calorimeter. The CSA, designed in 0.35 $μ$m N-well CMOS technology using 5V MOS transistors, has a wide linear operating range of 2.6 pC w.r.t the input charge with a power dissipation of 2.3 mW. A noise figure (ENC) of 820 e$^-$ at 0 pF of detector capacitance with a noise slope of 25 e$^-$/pF has been achieved (when followed by a CR-RC$^2$ filter of 1.2 $μ$s peaking time). This design of CSA provides a dynamic range (ratio of maximum detectable signal to noise floor) of 79 dB for the maximum input charge of 2.6 pC when connected to a silicon detector with a capacitance of 40 pF. Using folded cascode architecture-based input stage and low voltage high swing current mirrors as the load, the CSA provides an enlarged output swing when biasing the output node towards one supply rail and utilizing the voltage range towards the opposite rail. The design philosophy works for both polarities of a large input signal. This paper presents the design of CSA with a wide negative output swing for an anticipated input signal of positive polarity in the target application with a known detector biasing scheme.
