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一个互补的金属氧化物半导体光电子模拟前端预放大器,具有交叉合的活性负载,用于短距离LiDAR
Yunji Song1,2, Yejin Choi1,2, Dukyoo Jung3
1Division of Electronic & Semiconductor Engineering, Ewha Womans University, Seoul 03760, Republic of Korea.
Sensors (Basel, Switzerland)
|February 26, 2025
概括
本文介绍了用于LiDAR的CMOS模拟前端预放大器,其中包括芯片上的雪崩光二极管和交叉合的活性负载. 它实现了用于短距离应用的高动态范围和带宽.
科学领域:
- 电气工程 电气工程
- 光电学是指光电子产品.
- 集成电路设计 集成电路设计
背景情况:
- 短距离LiDAR系统需要高性能模拟前端 (AFE) 电路.
- 传统的跨阻抗放大器 (TIA) 在常态噪声排斥和带宽限制方面面临着挑战.
- 在芯片上的雪崩光二极管 (APD) 对于LiDAR信号检测至关重要.
研究的目的:
- 介绍一个新的CMOS光电子AFE预放大器用于短距离LiDAR.
- 为了增强常态噪声排斥,并实现宽带宽.
- 集成芯片上的APD与交叉合的活性负载,以提高性能.
主要方法:
- 一个空间调节的P+/N-well在芯片上的APD的设计.
- 实现一个带有交叉合活性负载的差异输入阶段.
- 包括芯片上的模拟APD,以改善常态噪声排斥.
- 利用交叉合的活性负载的诱导行为来扩展带宽.
主要成果:
- 实现了63.5 dB的动态范围 (1 μApp1.5 mApp输入电流回收).
- 证明了67.8dBΩ的传 impedance 增益和1.6GHz的带宽 (对于490 fF APD电容).
- 显示了6.83 pA/√Hz的噪声电流光谱密度和85 dB的电源排斥比.
- 从单个1.8V电源中报告了32.4mW的功耗消耗.
结论:
- 拟议的AFE预放大器为短距离LiDAR应用提供了卓越的性能.
- 交叉合的活性负荷和模拟APD的集成显著改善了噪声排斥和带宽.
- 该设计适用于紧的低功耗LiDAR系统,因为其芯片面积小,功耗低.
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