Research On Key Technologies Of Front-end Readout ASIC For PSD In Next Generation Dark Matter Particle Detection Satellite

Dark matter detection is currently one of the major frontier research issues in the field of particle physics and astrophysics in the world.China launched the first astronomical satellite Dark Matter Particle Detection Satellite DAMPE in 2015.Since DAMPE entered the predetermined orbit,the highest precision electron cosmic ray energy spectrum detection results in the world have been obtained.On the basis of the successful development and operation of DAMPE,the next generation of dark matter particle detection satellite will be developed.Recently,a number of domestic units jointly proposed to develop a very large area gamma space telescope(VLAST),space high-energy gamma ray detection.VLAST’s detectors from top to bottom include: ACD(Anti Coincidence Detector),STED(Silicon Tracker and low energy gamma-ray Detector),HEIC(High Energy Imaging Calorimeter).Considering the particularity of the space environment,the large-area demand of the detector,and the technical inheritance of DAMPE,the anti-coincidence detector is realized by the plastic scintillator array detector(PSD).Its main function is nuclide measurement and participation in the total trigger.In order to meet the actual needs of measurement,the area of the anti-coincidence detector is getting larger and larger,and the power consumption resources and volume of the satellite are strictly limited.Therefore,the front-end readout electronics of PSD proposes multi-channel,low power consumption,large dynamic,high counting rate,anti-radiation and other requirements.With the maturity of semiconductor detection technology,highly integrated ASIC(Application Specific Integrated Circuit)chip technology has been widely used in the field of space exploration.In recent years,due to changes in the external environment,the key core ASIC chip embargo risk is increasing.Therefore,this paper focuses on the design and development of multi-channel front-end readout ASIC for the requirements of high counting rate,large dynamic range and multi-channel energy measurement proposed by PSD front-end readout electronics system.Firstly,this paper analyzes the characteristics of the output signal of PSD detector,proposes the circuit system architecture of multi-channel front-end readout ASIC,designs high-precision energy measurement and time-triggered integrated circuit,and completes the design and simulation of a four-channel PSD front-end readout ASIC prototype chip.The main performance indicators meet the mission requirements.On this basis,the back-end design and tape-out test of a four-channel ASIC prototype chip are completed in 180 nm CMOS process,which realizes 10 p C large signal processing,supports 20 k Hz self-trigger and has good linearity.Finally,the joint test of the ASIC chip and PSD is completed,and the energy spectrum of the cosmic ray is obtained.The matching between the ASIC chip and the detector is verified,and the goal of the thesis is preliminarily achieved.The chip design work of this paper provides technical support for the development of high density readout chip for subsequent engineering applications.