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

被引:1
|
作者
Kim, H. -S. [1 ]
机构
[1] Dankook Univ, Dept Display Engn, Cheonan, South Korea
关键词
X-ray imaging; CMOS image sensors; X-ray spectroscopy; low-power electronics; photon counting; integrated circuit design; comparators (circuits); discriminators; sporadically-driven clock-less in-pixel multibit energy discriminator circuit; X-ray spectrometry CMOS PCD imager; photon-counting detector; asynchronous linear search; single-comparator; multiple energy-bins; material-selective imaging; minimal linear search; parallel search; flash-type discriminator; size; 130; nm; word length 3 bit; power; 1; muW; voltage; 3; V; 2; 6 mV to 3; mV; DETECTOR; ARRAYS;
D O I
10.1049/el.2016.2629
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
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.
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收藏
页码:1590 / 1592
页数:2
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