用于读取PMT信号的12位40 MSPS异步SAR ADC的设计和仿真
Design and simulation of a 12-bit, 40 MSPS asynchronous SAR ADC for the readout of PMT signal
摘要：
大型高空空气簇射天文台（LHAASO）水切伦科夫探测器阵列（WCDA）的读出系统要求高精度、大动态范围的测量。本文介绍了一种用于LHAASO WCDA读出的12位40 MSPS模数转换器（ADC）专用集成电路（ASIC）原型。将该ADC与我们前期完成的前端ASIC相结合，可以实现基于数字峰值检测方法的高精度电荷测量。该ADC采用低功耗的逐次逼近寄存器（SAR）结构，集成了电容式数模转换器（CDAC）、动态比较器和异步SAR控制逻辑等关键部件。仿真结果表明，在低于20 MHz的输入频率范围内，采样速率为40 MSPS时，有效位数（ENOB）优于10位，每通道功耗为6.6 mW。上述结果足以满足WCDA的读出要求。
英文摘要：
High precision and large dynamic range measurement are required in the readout systems for the Water Cherenkov Detector Array (WCDA) in Large High Altitude Air Shower Observatory (LHAASO). This paper presents a prototype of 12-bit 40 MSPS Analog-to-Digital Converter (ADC) Application Specific Integrated Circuit (ASIC) designed for the readout of LHAASO WCDA. Combining this ADC and the front-end ASIC finished in our previous work, high precision charge measurement can be achieved based on the digital peak detection method. This ADC is implemented based on power-efficient Successive Approximation Register (SAR) architecture, which incorporates the key parts such as Capacitive Digital-to-Analog Converter (CDAC), dynamic comparator and asynchronous SAR control logic. The simulation results indicate that the Effective Number Of Bits (ENOB) with a sampling rate of 40 MSPS is better than 10 bits in an input frequency range below 20 MHz, while its core power consumption is 6.6 mW per channel. The above results are good enough for the readout requirements of the WCDA.
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