An Automotive LiDAR SoC for 240 × 192-Pixel 225-m-Range Imaging With a 40-Channel 0.0036-mm2 Voltage/Time Dual-Data-Converter-Based AFE
| Autor: | Hisaaki Katagiri, Hirotomo Ishii, Kentaro Yoshioka, Hiroshi Kubota, Ta Tuan Thanh, Yoshinari Ojima, Hidenori Okuni, Yutaka Ota, Tomohiko Sugimoto, Katsuyuki Kimura, Akihide Sai, Matsumoto Nobu, Masatoshi Hirono, Satoshi Kondo, Shinichi Ohtsuka |
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| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | IEEE Journal of Solid-State Circuits. 55:2866-2877 |
| ISSN: | 1558-173X 0018-9200 |
| Popis: | This article presents a 40-channel high-resolution automotive LiDAR system-on-chip (SoC), which utilizes the world’s first dual-data converter (DDC). The proposed DDC consolidates the functions of ADC and TDC into a single circuitry and achieves acquisition of both high-precision time and voltage data from the input, realizing a 5 $\times $ smaller analog front-end (AFE) area than prior arts. Such innovations lead us to a 40-channel AFE integration of the SoC without silicon cost increase, which characterizes our LiDAR system with 2 $\times $ higher pixel resolution. To enhance the ADC’s signal-to-noise and distortion ratio (SNDR) without sacrificing the area efficiency, a calibration-free and variation-tolerant voltage-controlled oscillator (VCO)-based ADC with a multiphase pulse density modulator (MP-PDM)-based feedback is proposed. Our proof-of-concept LiDAR system achieves a measurement range of 225 m at 70-klx direct sunlight, with a resolution of 240 $\times $ 192 pixels at 10 frames per second (FPS). To quantitatively measure the effect of the resolution improvement of our LiDAR, we evaluate the LiDAR’s detection accuracy of small targets 75 m away. Due to the 2 $\times $ higher vertical pixel resolution, our LiDAR can detect targets with 2 $\times $ smaller height. The 3-D point cloud of the LiDAR captured outdoor in the wild is presented. |
| Databáze: | OpenAIRE |
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