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A prototype frontend LSI for gamma-ray detectors with GEM (Gas Electron Multiplier) foils has been designed and fabricated. For reduction of number of channels and fast readout, we adopted X- and Y-strip readout method. Obtained charges are converted to digital by 10-bit 10Msps pipelined ADCs on the chip. In order that the ghost images are reduced, which are the drawback of the X- and Y-strip method,...
A 10-bit 20 Msps integrating ADC is designed using single-slope analog-to-time conversion followed by 20 ps resolution time-to-digital conversion. Simulation study of the circuit is performed and it is shown that the target ADC device is realizable. The layout design, which is under preparation, will be soon submitted for fabrication and the characteristics of the chip will be obtained in the near...
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