Speaker
Description
The advent of fourth-generation synchrotron light sources carries both novel and compelling scientific opportunities, as well as new requirements for the instrumentation employed in detectors within such a framework. To address this challenge, a collaboration between Argonne National Laboratory, University of Pavia, and University of Bergamo devised a prototype readout to be utilised in x-ray science detectors leveraging continuous-wave light sources. The circuit has been developed in a commercial 65 nm CMOS technology and integrated in a pixelated ASIC, named pFREYA16 (prototype Fast Readout for ptYchography Applications with 16 channels). It includes a matrix of 16 pixels to verify the compliance of the designed channel with the detector requirements: a frame rate of 1 MHz, single-photon resolution with an ENC of 250 e- rms in four different modes (5, 9, 18, or 25 keV), linearity over the whole input dynamic range of 256 photons for all modes, and a power consumption of 220 uW per pixel. Each pixel integrates a semi-Gaussian unipolar RC-CR shaper with four selectable peaking times, a differential comparator chain to enable zero-suppression, an A/D chain with a differential S/H and a differential 10-bit SAR ADC, and some basic digital backend. The results of the characterisation of the mixed-signal readout channel, including noise measurements, will be the focus of the conference contribution. The data will provide insight into the steps to be taken for the expansion of the array to experiment-grade dimensions.
| Workshop topics | Front-end electronics and readout |
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