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Proceedings Paper

Advanced-readout ASICs for multielement CZT detectors
Author(s): Gianluigi De Geronimo; Paul O'Connor; Anand Kandasamy; Joe Grosholz
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Paper Abstract

A generation of high performance front-end and read-out ASICs customized for highly segmented CdZnTe sensors is presented. The ASICs, developed in a multi-year effort at Brookhaven National Laboratory, are targeted to a wide range of applications including medical, safeguards/security, industrial, research, and spectroscopy. The front-end multichannel ASICs provide high accuracy low noise preamplification and filtering of signals, with ver-sions for small and large area CdZnTe elements. They implement a high order unipolar or bipolar shaper, an innovative low noise continuous reset system with self-adapting capability to the wide range of detector leakage currents, a new system for stabilizing the output baseline and high output driving capability. The general-purpose versions include pro-grammable gain and peaking time. The read-out multichannel ASICs provide fully data driven high accuracy amplitude and time measurements, multiplexing and time domain derandomization of the shaped pulses. They implement a fast arbitration scheme and an array of innovative two-phase offset-free rail-to-rail analog peak detectors for buffering and absorption of input rate fluctuations, thus greatly relaxing the rate requirement on the external ADC. Pulse amplitude, hit timing, pulse risetime, and channel address per processed pulse are available at the output in correspondence of an exter-nal readout request. Prototype chips have been fabricated in 0.5 and 0.35 μm CMOS and tested. Design concepts and experimental results are discussed.

Paper Details

Date Published: 10 January 2003
PDF: 14 pages
Proc. SPIE 4784, X-Ray and Gamma-Ray Detectors and Applications IV, (10 January 2003); doi: 10.1117/12.455775
Show Author Affiliations
Gianluigi De Geronimo, Brookhaven National Lab. (United States)
Paul O'Connor, Brookhaven National Lab. (United States)
Anand Kandasamy, Brookhaven National Lab. (United States)
Joe Grosholz, eV Products (United States)

Published in SPIE Proceedings Vol. 4784:
X-Ray and Gamma-Ray Detectors and Applications IV
Ralph B. James; Edwin M. Westbrook; Roger D. Durst; Larry A. Franks; Arnold Burger; Edwin M. Westbrook; Roger D. Durst, Editor(s)

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