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Low-noise custom VLSI for CdZnTe pixel detectors

Cook, Walter R. and Burnham, Jill A. and Harrison, Fiona A. (1998) Low-noise custom VLSI for CdZnTe pixel detectors. In: EUV, X-ray, and Gamma-ray Instrumentation for Astronomy IX. Proceedings of SPIE. No.3445. Society of Photo-optical Instrumentation Engineers , Bellingham, WA, pp. 347-354.

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A custom analog VLSI chip is being developed for the readout of pixellated CdZnTe detectors in the focal plane of an astronomical hard X-ray telescope. The chip is intended for indium bump bonding to a pixel detector having pitch near 0.5 mm. A complete precision analog signal processing chain, including charge sensitive preamplifier, shaping amplifiers and peak detect and hold circuit, is provided for each pixel. Here we describe the circuitry and discuss the performance of a functional prototype fabricated in a 1.2um CMOS process at Orbit Semiconductor. Dynamic performance is found to be close to SPICE model predictions over a self-triggering range extending from 1 to 150 keV (200 to 30000 electrons). Integral nonlinearity (1 %) and noise (0.25 keV or 50 electrons FWHM with 200 fF input capacitance) while acceptable are not as good as predicted. Power consumption is only 250 uW per pixel. Layout and design techniques are discussed which permit successful self-triggering operation at the low 1 keV threshold.

Item Type:Book Section
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URLURL TypeDescription DOIArticle
Harrison, Fiona A.0000-0003-2992-8024
Additional Information:© 1998 by the Society of Photo-Optical Instrumentation. This work was supported by NASA under grant No. NAG5-5128.
Group:Space Radiation Laboratory
Funding AgencyGrant Number
Subject Keywords:x-ray astrophysics electronics CdZnTe
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Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory2003-26
Series Name:Proceedings of SPIE
Issue or Number:3445
Record Number:CaltechAUTHORS:20150305-162936326
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Official Citation:Walter R. Cook III ; Jill A. Burnham ; Fiona A. Harrison; Low-noise custom VLSI for CdZnTe pixel detectors. Proc. SPIE 3445, EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy IX, 347 (November 10, 1998); doi:10.1117/12.330328
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:55568
Deposited By: Deborah Miles
Deposited On:06 Mar 2015 18:09
Last Modified:10 Nov 2021 20:47

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