CIS Development Division, SK Hynix, Icheon 17336, Korea.
Department of Electronics Engineering, Chungnam National University, Daejeon 34134, Korea.
Sensors (Basel). 2019 Mar 9;19(5):1210. doi: 10.3390/s19051210.
This paper introduces a digital-assisted multiple echo detection scheme, which utilizes the waste time of the full serial data readout period in a focal plane array (FPA)-based laser detection and ranging (LADAR) receiver. With the support of an external digital signal processor (DSP) and additional analog memory inserted into the receiver, the proposed readout scheme can effectively enhance multi-target resolution (MTR) three times higher than the conventional FPA-based LADAR, while maintaining low power consumption and a small area. A prototype chip was fabricated in a 0.18-μm CMOS process with an 8 × 8 FPA configuration, where each single receiver pixel occupied an area of 100 μm × 100 μm. The single receiver achieved an MTR of 20 ns with 7.47 mW power dissipation, an input referred noise current of 4.48 pA/√Hz with a bandwidth 530 MHz, a minimum detectable signal (MDS) of 340 nA, a maximum walk error of 2.2 ns, and a maximum non-linearity of 0.05% among the captured multiple echo images.
本文提出了一种数字辅助的多次回波检测方案，该方案利用了基于焦平面阵列（FPA）的激光检测和测距（LADAR）接收器中完整串行数据读出周期的空闲时间。在外部数字信号处理器（DSP）和接收器中插入额外模拟存储器的支持下，所提出的读出方案可以有效地将多目标分辨率（MTR）提高三倍，高于传统的基于 FPA 的 LADAR，同时保持低功耗和小面积。一个原型芯片采用 0.18μm CMOS 工艺制造，具有 8×8 FPA 配置，每个单个接收器像素占据 100μm×100μm 的面积。单个接收器实现了 20ns 的 MTR，功耗为 7.47mW，带宽为 530MHz 时的输入参考噪声电流为 4.48pA/√Hz，最小可检测信号（MDS）为 340nA，最大行走误差为 2.2ns，最大非线性度为 0.05%，可在捕获的多个回波图像中。
