NDLI: PXD18k - fast single photon counting chip with energy window for hybrid pixel detector

Content Provider	IEEE Xplore Digital Library
Author	Szczygiel, R. Grybos, P. Maj, P. Zoladz, M.
Copyright Year	2011
Description	Author affiliation: AGH University of Science and Technology, Department of Measurement and Instrumentation, Al. Mickiewicza 30, 30-059 Krakow, Poland (Szczygiel, R.; Grybos, P.; Maj, P.; Zoladz, M.)
Abstract	We report on the design of an integrated circuit called PXD18k dedicated for readout of hybrid pixel semiconductor detectors used for X-ray imaging applications. The PXD18k has dimensions of 9.64 mm × 20 mm and is designed in CMOS 180 nm technology. The core of the IC is a matrix of 96×192 pixels with 100 µm ×100 µm pixel size working in a single photon counting mode. Each pixel contains two charge sensitive amplifiers with Krummenacher feedback scheme, two shapers, two discriminators (with independent threshold A and B) and two 16-bit ripple counters. To minimize the effective threshold spread, one 7-bit and one 5-bit trim DACs are used in each pixel for correction of threshold A and threshold B respectively. The data are read out via 8 LVDS outputs with 100 Mbps rate. The power consumption is dominated by the analog blocks and it is about 23 µW/pixel. The effective peaking time at the discriminator input is 30 ns and it is mainly determined by the time constants of the CSA. The gain is equal to 42.5 $µV/e^{−}$ and an Equivalent Noise Charge with bump-bonded detector is 168 $e^{−}$ rms. The effective threshold spread at the discriminator input is only 1.79 mV (at one sigma level, with 7-bit trim DACs enabled). The count rate per pixel depends on the effective CSA feedback resistance and for a standard setting a dead time of the front-end electronics is 172 ns (paralyzable model). The PXD18k IC works with two energy thresholds in the readout mode separate from exposure. When operating with two different energy thresholds, acquisition and readout are interleaved and the readout dead time is 740 µs. The PXD18k can also operate in a continuous readout mode with zero dead time and one can select the number of bits readout from each pixel to optimize the IC frame rate. For example for reading out 16 bits/pixel the frame rate is 2.7 kHz and for 4 bits/pixel it rises up to 7.1 kHz.
Starting Page	932
Ending Page	937
File Size	2296269
Page Count	6
File Format	PDF
ISBN	9781467301183
ISSN	10823654
e-ISBN	9781467301206
DOI	10.1109/NSSMIC.2011.6154126
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-10-23
Publisher Place	Spain
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Generators Layout Switches Histograms Gain measurement
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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