← 返回 JSSC 论文列表JSSC 2013第2期Image Sensors0.13μm/0.35μm CMOS
An Asynchronous Sampling-Based 128 128 Direct Photon-Counting X-Ray Image Detect
提出一种基于异步采样的128x128直接光子计数X射线图像探测器，用于高质量医疗成像应用。
增益107，静态功耗4.6mW，等效噪声电荷68e-，最小可检测能量290eV
光子计数X射线成像医疗成像异步采样能量区分
▸基于采样的电荷前置放大器与异步自复位技术
▸紧凑型像素内ADC实现能量级别区分
▸相关双采样技术降低闪烁噪声
Abstract
This paper presents a direct photo n-counting X-ray
image detector with a photoconductor for high-quality
medical imaging applications . The proposed sampling-based
charge preampli fier with asynchronous sel f-reset enables a pixel
to detect single X-ray photon energy with higher sensitivity and
faster processing rate. The use of the correlated double sampling
enabled by the sampling-based archi tecture also reduces flicker
noise and contributes to the achievement of high pixel-to-pixel
uniformity