A Flash-ADC data acquisition （DAQ） system has been developed for the drift chamber array designed for the External-Target-Experiment at the Cooling Storage Ring at the Heavy Ion Research Facility, Lanzhou. The simpl...A Flash-ADC data acquisition （DAQ） system has been developed for the drift chamber array designed for the External-Target-Experiment at the Cooling Storage Ring at the Heavy Ion Research Facility, Lanzhou. The simplified readout electronics system has been developed using the Flash-ADC modules and the whole waveform in the sampling window is obtained, with which the time and energy information can be deduced with an offiine processing. A digital filter algorithm has been developed to discriminate the noise and the useful signal. With the digital filtering process, the signal to noise ratio （SNR） is increased and a better time and energy resolution can be obtained.展开更多
Monte Carlo methods are used to analyze yields and performance of GaAs flash ADCs. Due to the nonuniformity of threshold voltage,the DNL and INL of flash ADC will decrease approximately linearly. And the higher the re...Monte Carlo methods are used to analyze yields and performance of GaAs flash ADCs. Due to the nonuniformity of threshold voltage,the DNL and INL of flash ADC will decrease approximately linearly. And the higher the resolution of ADC is, the faster these key nonlinear parameters decrease. When the nonuniformity increases to some degree,the yields of GaAs flash ADCs will decrease exponentially,and the missing code will increase more quickly for the higher resolution ADCs. So,GaAs HBT and HEMT with technology of etching stop will be widely used in high speed and high resolution ADCs.展开更多
基金Supported by National Basic Research Program of China(973)(2015CB856903 and 2014CB845405)partly by National Science Foundation of China(U1332207 and 11375094)by Tsinghua University Initiative Scientific Research Program
文摘A Flash-ADC data acquisition （DAQ） system has been developed for the drift chamber array designed for the External-Target-Experiment at the Cooling Storage Ring at the Heavy Ion Research Facility, Lanzhou. The simplified readout electronics system has been developed using the Flash-ADC modules and the whole waveform in the sampling window is obtained, with which the time and energy information can be deduced with an offiine processing. A digital filter algorithm has been developed to discriminate the noise and the useful signal. With the digital filtering process, the signal to noise ratio （SNR） is increased and a better time and energy resolution can be obtained.
文摘Monte Carlo methods are used to analyze yields and performance of GaAs flash ADCs. Due to the nonuniformity of threshold voltage,the DNL and INL of flash ADC will decrease approximately linearly. And the higher the resolution of ADC is, the faster these key nonlinear parameters decrease. When the nonuniformity increases to some degree,the yields of GaAs flash ADCs will decrease exponentially,and the missing code will increase more quickly for the higher resolution ADCs. So,GaAs HBT and HEMT with technology of etching stop will be widely used in high speed and high resolution ADCs.
