Transactions of Nanjing University of Aeronautics & Astronautics
Research on Influence of Low Coupling Capacitance in the RENA-3-Based Particle Detection System
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Abstract:
The performance of a particle detection system is primarily determined by its first stage， which mainly includes a particle radiation detector and a charge-sensitive preamplifier （CSA）. The connection between the detector and the front-end readout circuit is typically AC-coupled， which usually has a coupling capacitor in the range of 0.01—0.1 μF to isolate the input of the CSA from the detector. The application-specific integrated circuit （ASIC） readout electronics for nuclear applications 3（RENA-3） is a multi-channel mixed-signal integrated circuit （IC） offering high energy resolution and high time resolution， developed for the readout of particle radiation detectors. RENA-3 is employed as the front-end readout circuit for an interplanetary energetic particle telescope designed to detect 20─1 000 keV electrons， 25─12 000 keV protons， and ions like alpha particles. However， the maximum input charge of RENA-3 is 54 fC， which limits its maximum detection range to about 1 200 keV and is insufficient for the proton channels. While other ASICs could be adopted， available alternatives do not simultaneously meet the requirements for both high precision and wide measurement range. This paper proposes the use of a small coupling capacitance to extend the range for proton detection by attenuating the charge signal before it reaches the CSA input. The coupling capacitance is on the order of picofarads， much smaller than the detector junction capacitance. In this configuration， stray capacitance and coupling capacitance become significant. A circuit theoretical model is proposed to calculate the transfer function from input charge to output voltage， analyzing the influence of coupling capacitance and stray capacitance on the particle radiation detection system. Experiments using discrete components with known parameters are conducted to validate the theoretical model. Finally， the model is applied to the RENA-3 system for optimization to meet the instrument’s specifications， and certain RENA-3 parameters are derived.
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This work was supported in part by the National Natural Science Foundation of China under contracts （Nos.42127803，42225404， 42150105） and the National Key R&D Program of China （No.2023YFC2808904）.
Clc Number:
TN722
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