Abstract. We present an accurate laser radar receiver with a wide dynamic range intended for ranging applications based on an event-based approach, in which a receiver-time-to-digital converter is used to extract the timing information from the reflected echo. The receiver is based on LC resonance pulse shaping at the input so that the unipolar pulse detected by the avalanche photodiode is converted to a bipolar signal, and the first zero-crossing of this converted signal is marked as the only timing point. One important aspect of the proposed scheme is that it does not need any postcompensation or gain control for achieving a wide dynamic range. The receiver chip was fabricated in a 0.35-μm standard CMOS technology, and a laser radar platform was developed to verify the functionality of the proposed receiver channel. The measured accuracy of the receiver is ±3.5 cm within a dynamic range of more than 1:250,000 using 3-ns FWHM pulses when target materials with different reflectivities are used in the measurements. The single-shot precision of the receiver (σ value) is ∼5 cm for a minimum SNR of ∼10.

中文翻译：

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基于过零定时检测的高速宽动态范围线性模式飞行时间接收机

摘要。我们提出了一种具有宽动态范围的精确激光雷达接收器，用于基于基于事件的方法的测距应用，其中使用接收器时间数字转换器从反射回波中提取时间信息。接收器基于输入端的 LC 谐振脉冲整形，以便将雪崩光电二极管检测到的单极脉冲转换为双极信号，并将该转换信号的第一个过零标记为唯一的定时点。所提议方案的一个重要方面是它不需要任何后补偿或增益控制来实现宽动态范围。接收器芯片采用 0.35-μm 标准 CMOS 技术制造，并开发了一个激光雷达平台来验证所提议的接收器通道的功能。当在测量中使用具有不同反射率的目标材料时，使用 3 ns FWHM 脉冲在超过 1:250,000 的动态范围内，接收器的测量精度为 ±3.5 cm。接收器的单次精度（σ 值）为 5 cm，最小 SNR 为 10。