Multichannel data acquisition system based on FPGA for high resolution spectroscopy

A complete four channels acquisition system for high-resolution spectroscopy has been designed and realized. The analogue section is composed of four semi-Gaussian shaping amplifiers with two software-selectable shaping times. The shaping times (150 ns and 450 ns) were chosen to perform either high rate or best resolution XRF measurements with state-of-the-art multi-element silicon drift detectors. The pulse amplitudes are caught by four large-bandwidth peak-stretchers whose outputs are multiplexed into a single 10 MHz 12 bit ADC. An FPGA operating at 24 MHz (or 48 MHz) clock frequency controls the whole process and stores the four spectra in the on-chip RAM, thus guaranteeing a maximum counting rate per bin of 332 kcps and an overall counting rate in excess of 4 Mcps. The system interfaces the host PC by means of the enhanced parallel port with a custom made control software for data visualization and analysis as in a conventional MCA system. If more than four channels have to be managed, various boards can be operated in parallel on the same EPP bus.