GEM imaging detector based on FET array readout

Novel readout method and architecture is essential in order to fully exploit the high spatial resolution of GEM imaging detector. A GEM readout method was proposed, which uses FET as switch for each pad and reading out electronic signal column-by-column. Following the demonstration study of its working principle using FET in separated package, a FET array ASIC is designed and tested, and its basic performance meet the requirements from the system. Great effort was made to design a practical and reliable package which meets the tight requirement in space. Finally a prototype system was set up and tested using soft X-ray source. The preliminary test result will be presented in this paper.