Abstract
Digital pulse processing finds a widespeed use in nuclear instrumentation. This work presents a digital pulse processing (DPP) module based on an FPGA and a 16-bit 125 MHz ADC and analyses the system noise distribution by acquired digital data using this system. A moving average filter is utilized to suppress the system noise of the DPP module. Furthermore, digital trapezoidal filter is applied for the use with a charge sensitive preamplifier with High Purity Germanium (HPGe) detector. The energy spectrum and corresponding resolution are demonstrated with a scintillation and semiconductor detector.
Highlights
Digital pulse processing (DPP) has been widely used in the ionizing radiation field recently
Amplitude depends on the system noise, and on the instantaneous value of the offset, which is very critical for a nuclear instrumentation for it is proportional to the amount of charge
The continuous signal from a radiation detector is sampled by the analog-to-digital converters (ADCs) LTC2185 and processed by the Field Programmable Gate Arrays (FPGAs) LatticeXP2 in real-time
Summary
Digital pulse processing (DPP) has been widely used in the ionizing radiation field recently. It has many advantages compared to analog system in the development phase and update period [1]. DPP modules have become more and more popular during the past decades since the development of semiconductor and digital components, such as Field Programmable Gate Arrays (FPGAs) and high-speed analog-to-digital converters (ADCs). The amplifier and ADC are assigned to accurately and reliably amplify or sample the amplitude of a continuous voltage pulse that can be subject to various noise sources [2]. A DPP module is handled, which contains a free-running sampling ADC and an FPGA for real-time pulse analysis. The system response to signals from a pulse generator and radiation detectors are investigated
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