Su Han, Bumjun Kim, Seonghyeok Park, Yongjae Park, J. Chun, Jaehyuk Choi, Seong-Jin Kim
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引用次数: 0
摘要
本文提出了一种基于双模拟计数器的最小尺寸为1110μm2的像素级直方图TDC的CMOS闪光激光雷达传感器。与传统的数字计数器相比,用直方图存储器代替模拟计数器的功耗降低了3300倍。模拟计数器和每个像素的定时发生器被重新配置为单斜率ADC (SS-ADC),具有自参考斜坡,减轻了计数器的不均匀性。该原型激光雷达传感器采用0.11 μ m CMOS工艺制造,在7.5m距离下具有2.3cm深度分辨率。一个模拟计数器只消耗8nW的像素内直方图操作。
A 100×80 CMOS Flash LiDAR Sensor with 0.0011mm2 In-Pixel Histogramming TDC Based on Analog Counter and Self-Calibrated Single-Slope ADC
This paper presents a CMOS flash LiDAR sensor with an in-pixel histogramming TDC occupying the smallest size of 1110μm2 based on dual analog counters. The proposed analog counter replaced with histogram memories achieves 3,300-fold power reduction compared with the conventional digital counter. The analog counters and a timing generator in each pixel are reconfigured to a single-slope ADC (SS-ADC) with a self-referenced ramp mitigating nonuniformities of counters. The prototype LiDAR sensor fabricated in a 0.11µm CMOS process demonstrates a 2.3cm depth resolution at a 7.5m distance. An analog counter only consumes 8nW for in-pixel histogramming operation.