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Low Noise 64-Channel ASIC for AC and DC Coupled Strip Detectors

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5 Author(s)
Grybos, P. ; Dept. of Meas. & Instrum., Univ. of Sci. & Technol.-AGH, Krakow, Poland ; Kachel, M. ; Kmon, P. ; Szczygiel, R.
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A 64-channel ASIC (SXDR64) aimed to work with both AC and DC coupled detectors (Si, CdTe, GaAs), in a single photon counting mode with an energy window has been developed. Every channel of the ASIC consists of a charge sensitive amplifier, a pole-zero cancellation circuit, a 4th order shaper with programmable gain from 14 μV/e- to 50 μV/e- and peaking time from 115 ns to 380 ns, a base-line restorer, two independent discriminators, and two 20-bit counters. Control and readout of the chip are done using on-chip LVDS drivers/receivers. The ASIC can work with input leakage currents in the range from -10 nA up to 7 nA. The ENC obtained with an AC-coupled Si detector is 120 e- for a peaking time Tp=115 ns and Cdet=1.2 pF. With a DC-coupled CdTe detector, the ENC is 210 e- rms for a peaking time Tp=380 ns and Cdet=2 pF and the leakage current Idleak=0.15 nA. The implemented trim DACs at the discriminator inputs allows to minimize the effective threshold spread to 8 e- rms (at one sigma level). The ASIC is designed in a CMOS 0.35 μm technology and its total area is 4800×5000 μm2.

Published in:

Nuclear Science, IEEE Transactions on  (Volume:58 ,  Issue: 1 )

Date of Publication:

Feb. 2011

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