Sporadically-driven clock-less in-pixel multi-bit energy discriminator for X-ray spectrometry CMOS PCD imagers

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A compact size and low-power multi-bit energy discriminator circuit is presented for X-ray spectrometry CMOS photon-counting detector (PCD) pixels. Because the circuit design is based on an asynchronous linear search, the discriminator with only a single-comparator classifies a sporadically incoming photon into multiple energy-bins, resulting in high spatial resolution and functionality of material-selective imaging. The proposed pixel power required to perform a minimal linear search is significantly less than the power of a conventional parallel search implemented in a flash-type discriminator. A prototype is fabricated in a 130-nm CMOS, and a 3-bit discriminator occupies only 23 x 60 m(2). The circuit dissipates a static power of 1 W with a power supply of 3.3 V (analogue) and 1.2 V (digital). The inaccuracy of energy-binning is measured to be 2.6-3.3 mV rms.
Publisher
INST ENGINEERING TECHNOLOGY-IET
Issue Date
2016-09
Language
English
Article Type
Article
Citation

ELECTRONICS LETTERS, v.52, no.19

ISSN
0013-5194
DOI
10.1049/el.2016.2629
URI
http://hdl.handle.net/10203/251858
Appears in Collection
EE-Journal Papers(저널논문)
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