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We developed a multi-channel digital acquisition (DAQ) system, able to operate in connection to Germanium-based detectors and state-of-the-art charge sensitive preamplifiers. The DAQ system is composed of up to 6 front-end NIM modules, each one with 4 free running analog to digital converters (100 MHz, 14 bits) and up to 6 custom PCI based receiver boards inside a single personal computer (PC). We...
A new compact circuit architecture is proposed for digitized preamplifiers of semiconductor detector signals, suitable for high-resolution gamma-ray spectroscopy. The circuit features single power supply, active decay time reduction, differential output with precise common mode level setting for ADC matching, auto zeroing of the differential output signal offset. Use of a single power supply minimizes...
A multi-channels data acquisition system for nuclear spectroscopy applications with HPGe detectors has been designed, manufactured and tested. It is based on a front-end electronics for analog signal conditioning, followed by a free running analog to digital converter. The digital output data-stream is collected and transmitted on twisted copper wires by means of programmable logic devices and dedicated...
We present a negative-feedback control structure which forces the analog voltage of digitized preamplifiers to stay within the ADC input range, even when the preamplifier fall time is long (ms range) and the event rate is high (100 kHz range). A suitable voltage is dynamically added to the preamplifier signal so as to cancel the baseline shifts brought about by event pileup, low-frequency disturbances,...
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