A 64-Channel Data Acquisition System-Based Ultralow Noise Transimpedance Amplifier for an Ionization Profile Monitor
A 64-Channel Data Acquisition System-Based Ultralow Noise Transimpedance Amplifier for an Ionization Profile Monitor
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DOI：
10.1109/tns.2022.3189683
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Jin Pan
中科院分区：
文献类型：
--
作者：
Tian Wang;Zhixue Li;Hongming Xie;Junxia Wu;Kewei Gu;Yuan Wei;Jianjun Su;Ruixia Tian;Yanyu Wang;Jin Pan
To meet the high time-resolution requirements of a fast ionization profile monitor (IPM), a 64-channel electrical signal acquisition system with a fast response frequency of 1 MHz has been developed. This article initially describes an ultralow noise transimpedance amplifier, which is an analog front-end (AFE) electronics aiming to achieve a balance between the accuracy and bandwidth, as well as to truly reflect the microstructure of short beam pulses. Subsequently, a synchronized multichannel data transmission system based on field-programmable gate arrays (FPGAs) transmits data streaming with the low latency and high throughput, and meanwhile, it provides data homogeneity in time across channels. The system is designed in a modular way to easily extend up to 128 channels. The nonlinearity of the readout electronics is less than 0.2&x0025; in the dynamic range of 15 nA&x2013; $15~mu text{A}$ , and the relative resolution is 0.15&x0025; at the input current of 15 $mu text{A}$ . The spurious-free dynamic range (SFDR) is about 82.43 dB at a fundamental frequency of 1 kHz, and the effective number of bits (ENOB) of the analog-to-digital conversion (ADC) is better than 13 bits. The relative synchronization time discrepancy between channels is better than 2.5&x0025; of the sampling cycle. Finally, the system is deployed for the beam profile measurement with an IPM. The obtained peak value shows a good proportionality with the beam intensity increment, and all the electronics properties achieve reasonable and excellent performance.
