In this paper, we present the design and preliminary results of a novel low-noise front-end readout application-specific integrated circuit (ASIC) for a PET imaging system whose objective is to achieve the following performances: the spatial resolution of mm , the detection efficiency of 15% and the time resolution of 1 ns. A cascode amplifier based on the PMOS input transistor is selected to realize the charge-sensitive amplifier (CSA) for the sake of good noise performances. The output of the CSA is split into two branches. One is connected to a slow shaper for energy measurements. The other is connected to a fast shaper for time acquisition. A novel monostable circuits is designed to adjust the time delay of the trigger signals so that the peak value of the shaped voltages can be sampled and stored. An eight-channel front-end readout prototype chip is designed and implemented in m CMOS process. The die size is mm mm. The input range of the ASIC is from 2000 e-to 180000 e-, reflecting to the energy level of the gamma ray from 11.2 keV to 1 MeV. The gain of the readout channel is 65 mV/fC. The tested result of ENC is 86.5 e-at zero farad plus 9.3 e-per picofarad. The nonlinearity is less than 3%. The crosstalk is less than 2%. The power dissipation is about 3 mW/channel.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.