Nuclear Techniques ›› 2017, Vol. 40 ›› Issue (12): 120401-120401.doi: 10.11889/j.0253-3219.2017.hjs.40.120401


Low noise waveform sampling and digitization circuit design

SHEN Fengzhao, ZHANG Jinglong, ZHOU Rong, YANG Chaowen   

  1. Department of Nuclear Engineering and Technology, College of Physical Science and Technology, Sichuan University, Chengdu 610065, China
  • Received:2017-05-20 Revised:2017-08-14 Online:2017-12-10 Published:2017-12-08
  • Supported by:
    Supported by National Natural Science Foundation of China (No.11205108, No.11475121), Excellent Youth Fund of Sichuan University (No.2016SCU04A13)

Abstract: Background: The accuracy of nuclear signal measurement is often affected by electronic noise. Purpose: This study aims to design a low noise circuit to enhance the accuracy of nuclear signal measurement and reduce circuit local noise. Methods: The design of waveform digital circuit for low noise is studied to reduce the noise of analog circuit and the interference between digital circuit and power supply. An energy spectrum measuring system that combine this waveform digital circuit with a high purity germanium detector was setup to test its performance on radiation energy spectrum. Results: A circuit with noise level of 0.120 mV is designed and implemented. The energy spectrum measurement achieved an energy resolution of 0.29% at 778.9 keV of 152Eu radiation source. This result shows that the low noise circuit performs as well as commercial digitizer abroad. Conclusion: This low noise waveform digital circuit is an important hardware basis for high-precision acquisition of nuclear signal information.

Key words: Low noise, Digital, HPGe, Energy spectrum

CLC Number: 

  • TL82