Implementing method of optimum front-end conditioner based on Butterworth filter

Implementing method of optimum front-end conditioner based on Butterworth filter 1 corresp first-author E-mail: softyv@vip.sina.com E-mail: softyv@vip.sina.com softyv@vip.sina.com 1 1 Key Laboratory for Radiation Physics and Technology of Ministry of Education of China , Physics Science and Technology College of Sichuan University, Chengdu 610064, China Key Laboratory for Radiation Physics and Technology of Ministry of Education of China , Physics Science and Technology College of Sichuan University, Chengdu 610064, China The front-end conditioner is an essential part of digital systems of nuclear spectrometer, which functions in two ways: (1) prevents saturation of the subsequent ADC; (2) limits the bandwidth of frequency to realize anti-aliasing. To realize the above-mentioned functions, an optimum front-end conditioner for a resistive feedback charge-sensitive preamplifier is designed. In the conditioner, the pole-zero compensation (P/Z compensation) technique was used to effectively filter signals from the preamplifier. The Butterworth filter was improved after the pole-zero position was optimally set up to shape the wave of output, which tallied with the whole system. The front-end conditioner can resolve the aberration of waveform of nuclear signals in a regular Butterworth filter. Compared with the traditional triple-pole filtering circuitry, the circuitry of this conditioner is more compact and flexible. Moreover, its output waveform is more symmetrical and the signal-to-noise ratio (SNR) is higher. The improvement in the resolution of spectrometer is also significant. Digital nuclear spectrometer Pole-zero compensation Butterworth filter References Geraci A , Ripamonti G . Nucl Instr Meth Phys Res , 1998 , A403 : 455 - 464 Nucl Instr Meth Phys Res Pullia A , Gritti G . IEEE Transactions on Nuclear Science , 1997 , 44 ( 3 ): 331 - 337 IEEE Transactions on Nuclear Science Nicholson P W . Nuclear Electronics, Wiliy-Interscience Publication 1974 , 6 Nuclear Electronics, Wiliy-Interscience Publication Geraci A , Pullia A . Automatic pole-zero/zero-pole digital compensator for high-resolution spectroscopy design and experiments 0-7803-5021-9/99 , 1999 IEEE . 891 - 895 . Automatic pole-zero/zero-pole digital compensator for high-resolution spectroscopy design and experiments 0-7803-5021-9/99 Baker B C . Anti-aliasing, analog filters for data acquisition systems microchip technology, 1999 AN699 , http://ww1.microchip.com/downloads/en/AppNotes/00699b.pdf Anti-aliasing, analog filters for data acquisition systems microchip technology, 1999 AN699 10.1016/S1001-8042(06)60043-2 TL817,TN79 + 2 2005-12-16 2006-08-20 2021-01-19 2006 Nuclear Science and Techniques 04 17