University of Oulu

Aram Baharmast and Juha T. Kostamovaara "High-speed wide dynamic range linear mode time-of-flight receiver based on zero-crossing timing detection," Optical Engineering 59(10), 104102 (14 October 2020).

High-speed wide dynamic range linear mode time-of-flight receiver based on zero-crossing timing detection

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Author: Baharmast, Aram1; Kostamovaara, Juha1
Organizations: 1University of Oulu, Faculty of Information Technology and Electrical Engineering, Circuits and Systems Research Unit, Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 3 MB)
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Language: English
Published: SPIE, 2020
Publish Date: 2021-01-18


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.

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Series: Optical engineering
ISSN: 0091-3286
ISSN-E: 1560-2303
ISSN-L: 0091-3286
Volume: 59
Issue: 10
Article number: 104102
DOI: 10.1117/1.OE.59.10.104102
Type of Publication: A1 Journal article – refereed
Field of Science: 213 Electronic, automation and communications engineering, electronics
Funding: This work was supported by the Academy of Finland under Contract No. 317144, which was gratefully acknowledged.
Academy of Finland Grant Number: 317144
Detailed Information: 317144 (Academy of Finland Funding decision)
Copyright information: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.