Abstract
We present the design and performance of a 64-channel ASIC called SXDR64. The circuit is intended to work with DC coupled CdTe detectors as well as with standard AC coupled Si detectors. A single channel of the ASIC consists of a charge sensitive amplifier with a pole-zero cancellation circuit, a 4th order programmable shaper, a base-line restorer and two independent discriminators with 20-bit counters equipped with RAM. The circuit is able to operate correctly with both polarities of the input signal and the detectors leakage current in a few nA range, with the average rate of input pulses up to 1 Mcps.
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