Abstract

The characteristics of a very general readout for X-rays multi-detectors are presented. This readout is composed of two integrated circuits of ten identical channels. The analog circuit provides an input equivalent noise charge of less than 70 e rms at room temperature that allows the elimination of scattered X-rays and other background in fluorescence excitation mode experiments, for photons energy higher than 10 keV interacting with a silicon detector. The typical full width at half maximum of the output pulse is 2.2 μs and the gain is 125 mV/fC for a total dc power consumption of about 35 mW/channel. The digital circuit is composed of a high accurate window comparator followed by a 16 bits counter and by a 16 bits buffer. It can be directly read by a computer through a parallel bus without interrupting the photons counting. The whole system provides a significant improvement in X-rays detector readout and will open new opportunities in experiments which require one or several of these three performances: high counting rate, high spatial resolution and high energy resolution.

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