Research on high-precision LADAR sensor chip
Laser detection and ranging (LADAR) is a radar system that uses the light source from the ultraviolet to infrared spectrum. It is a combination of laser and radar technology. The active, fast, high-precision, non-contact acquisition of large and irregular point clouds contain three-dimensional spatial coordinate information (X, Y, Z) and other information (such as echo intensity). And it has become the main detection means in the field of earth observation, intelligent vehicle, medical treatment and other fields in recent years. LADAR is considered to be another major technological revolution in the surveying and mapping industry after GPS technology, and it is the international frontier of current technological development. Over the past 10 years, the LADAR technology has made a series of remarkable progress, which has greatly improved the accuracy, speed, dimension and range of measurement, as well as stability, ease of use and light weight of equipment. Aiming at the development of miniaturization and integration of LADAR, a high bandwidth and low noise full differential amplifier (FDMA) for TOF imaging LADAR detection system is designed in this paper. The chip uses a multi-stage cascade structure and active inductor technology to increase circuit bandwidth and reduce chip area. By using offset isolation technology, the robustness of each gain stage to process variations is enhanced. As a part of the LADAR system integrated chip, the FDMA chip satisfies the requirement of system well.
Prof. Zhu Jingguo’s team from the Institute of Microelectronics of the Chinese Academy of Sciences is dedicated to the research and development of new laser detection and sensing technologies. In order to miniaturize the laser radar pulse ranging system and apply it to portable applications, the research team proposed a design goal to achieve a single-chip fully integrated system. Because of the limitations of the current analog-digital hybrid design process and device fabrication process platform, the method of the multi-chip hybrid integration design is proposed to solve the miniaturized problem and it can ensure the success in the initial design. Focuses on the research of TOF imaging LADAR, the system integrated chip and a series of sub-module chips are designed by the research team, including preamplifiers, differential amplifiers, comparators, etc. At the same time, for the application requirement of multi-channel LADAR, two series chip of multi-channel and single-channel are designed and six research papers are published. The laboratory established the simulation environment and test platform of the laser radar ranging system chip, which laid the foundation for the final realization of the single-chip fully integrated laser radar pulse ranging system.
Photograph of the fully differential main amplifier chip
Testing environment and apparatus
This work is supported by the National Science Foundation of Youth Fund (No. 61605216) .
About the Group
The LADAR team of the Institute of Microelectronics of the Chinese Academy of Sciences is a professional team that conducts laser radar research and application development earlier. It is composed of more than 20 young and middle-aged researchers. It is an innovative research team with rich experience and infinite vitality. The professional background of the members includes: optical engineering, automation, microelectronics technology, signal processing, computer technology, photogrammetry, etc. Focus on high-precision laser detection, laser three-dimensional imaging, laser detection and other fields for many years, the engineering experience accumulation is well-done. In recent years, a large amount of work has been carried out in the direction of concealed optical target detection and suppression, and the team is quite effective. The team has presided over or participated in more than 40 projects including National Major Special Projects, 863 Plan, National Major Science and Technology Plan, National Science and Technology Support, National Natural Science Foundation, Key Deployment of Chinese Academy of Sciences, Major Equipment Development of Chinese Academy of Sciences, Chinese Academy of Sciences National Defense Innovation, and cooperation between Chinese Academy of Sciences and the Ministry of Science and Technology. Besides developing more than 10 types of in-vehicle and ground-based LADAR systems, it has published more than 50 papers, applied for/authorized more than 20 patents, 4 software copyrights, participated in 3 standard writings, and 1 monograph.
Jiang Yan, Liu Ruqing, Zhu Jingguo, et al. A high-performance CMOS FDMA for pulsed TOF imaging LADAR system[J]. Opto-Electronic Engineering, 2019, 46(7): 190194. copy