M. Nazrul  Islam, T.  Fujiwara, S.  Kenji, H.  Takahashi, Kh.  Kh. Asaduzzaman, Md.  Shahzamal, Md.N. Haque  Mia, M.S.  Alam, Mahmudul  Hasan, Mahbubul  Hoq, 
    Design and Development of a Charge-Sensitive Preamplifier for Nuclear Pulse 
  Processing,
    International Journal of System Signal Control and Engineering Application,
    Volume 7,Issue 2,
    2014,
    Pages 33-35,
    ISSN 1997-5422,
    ijssceapp.2014.33.35,
    (https://makhillpublications.co/view-article.php?doi=ijssceapp.2014.33.35)
    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 C<SUB>in</SUB> = 
  AC<SUB>f</SUB>, where A is the open-loop gain of the op-amp. If the op-amp gain 
  is high enough that C<SUB>i</SUB>&lt;&lt;C<SUB>in</SUB>, the external capacitance 
  can be neglected. The charge Q is stored onto the feedback capacitor C<SUB>f</SUB>, 
  producing an output pulse of height V = -Q/C<SUB>f</SUB> 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.
    Keywords: Radiation;etector; op-amp;preamplifier and charge-sensitive preamplifier;resistor