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In this paper,to design a new preamplifier for optimum performances with charged-particle or heavy-ion detectors,the CMOS FET is implemented as a feedback capacitor Cfp.so that the entire system should be built only with MOSFET.This work is a revolution design because to realize an ASIC for a preamplifier circuit,the capacitor will also be included.We succeed after a simulation to maintain a rise time less than 3 ns,the output resistance less than 94 Ω and the linearity almost good.