Authors : M. Nazrul Islam, T. Fujiwara, S. Kenji, H. Takahashi, Kh. Kh. Asaduzzaman, Md. Shahzamal, Md.N. Haque Mia, M.S. Alam, Mahmudul Hasan and Mahbubul Hoq
Abstract: Researchers attempt to describe a charge-sensitive preamplifier for fast pulse processing. The charge sensitive preamplifier uses a capacitor in place of the feedback resistor. The input capacitance of this circuit is Cin = ACf, where A is the open-loop gain of the op-amp. If the op-amp gain is high enough that Ci<<Cin, the external capacitance can be neglected. The charge Q is stored onto the feedback capacitor Cf, producing an output pulse of height V = -Q/Cf independent of the detector and stray capacitances. Since, there is a high voltage on the detector electrode, the amplifier input is connected to the cathode of the GM detector through a ground full-up resistor.
M. Nazrul Islam, T. Fujiwara, S. Kenji, H. Takahashi, Kh. Kh. Asaduzzaman, Md. Shahzamal, Md.N. Haque Mia, M.S. Alam, Mahmudul Hasan and Mahbubul Hoq, 2014. Design and Development of a Charge-Sensitive Preamplifier for Nuclear Pulse Processing. International Journal of Signal System Control and Engineering Application, 7: 33-35.