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We developed a new front-end application specific integrated circuit (ASIC)for the upgrade of the Maia x-ray microprobe. The ASIC instruments 32configurable front-end channels that perform either positive or negative chargeamplification, pulse shaping, peak amplitude and time extraction along withbuffered analog storage. At a gain of 3.6 V/fC, 1 $\mu$s peaking time and atemperature of 248 K, an electronic resolution of 13- and 10 electrons rms wasmeasured with and without a SDD sensor respectively. A spectral resolution of170 eV FWHM at 5.9 keV was obtained with an $^{55}$Fe source. The channellinearity was better than $\pm$ 1 % with rate capabilities up to 40 kcps. TheASIC was fabricated in a commercial 250 nm process with a footprint of 6.3 mm x3.9 mm and dissipates 167 mW of static power.

Development of a High Rate Front-end ASIC for X-ray Spectroscopy and Diffraction Applications