Readout ASIC for 3D Position-Sensitive Detectors

We describe an application specific integrated circuit (ASIC) for 3D position-sensitive detectors. It was optimized for pixelated cadmium-zinc-telluride (CZT) sensors, and it measures, corresponding to an ionizing event, the energy and timing of signals from 121 anodes and one cathode. Each channel...

Full description

Saved in:
Bibliographic Details
Published in:IEEE transactions on nuclear science 2008-06, Vol.55 (3), p.1593-1603
Main Authors: De Geronimo, G., Vernon, E., Ackley, K., Dragone, A., Fried, J., O'Connor, P., Zhong He, Herman, C., Feng Zhang
Format: Article
Language:English
Subjects:
Amplification
Anodes
Application specific integrated circuit (ASIC)
Application specific integrated circuits
Cadmium-Zinc-Telluride (CZT)
Cathodes
Channels
Charge
Charge measurement
Current measurement
Detectors
Electronics
Energy measurement
Integrated circuit measurements
Position sensitive particle detectors
Shape measurement
Three dimensional
Time measurements
Timing
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We describe an application specific integrated circuit (ASIC) for 3D position-sensitive detectors. It was optimized for pixelated cadmium-zinc-telluride (CZT) sensors, and it measures, corresponding to an ionizing event, the energy and timing of signals from 121 anodes and one cathode. Each channel provides low-noise charge amplification, high-order shaping, along with peak- and timing-detection. The cathode's timing can be measured in three different ways: the first is based on multiple thresholds on the charge amplifier's voltage output; the second uses the threshold crossing of a fast-shaped signal; and the third measures the peak amplitude and timing from a bipolar shaper. With its power of 2 mW per channel the ASIC measures, on a CZT sensor connected and biased, charges up to 100 fC with an electronic resolution better than 200 e - rms. Our preliminary spectral measurements applying a simple cathode/anode ratio correction demonstrated a single-pixel resolution of 4.8 keV (0.72 %) at 662 keV, with the electronics and leakage current contributing in total with 2.1 keV.
ISSN:0018-9499
1558-1578
DOI:10.1109/TNS.2008.922217