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Fast counting applications with energy discrimination like X-ray absorption spectroscopy require an energy resolution of some hundred eV even at highest count rates and ask for small form factors. The development, fabrication and test of a small number of 7-cell Si-drift detectors have been successfully finished at DESY fitting these claims with a good cost-versus-performance tradeoff. The monolithic...
This paper describes a mixed-signal seven-channel ASIC in 0.35-mum BiCMOS technology for the readout of Si-drift detectors used in X-ray spectroscopy. An integral count rate of more than four million pulses per second can be achieved. Count rate- and photon energy-related changes of the input pulse shape are compensated by a baseline-holding circuit, where the baseline instability remains below 1%...
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