0.41-pJ/b/dB Asymmetric Simultaneous Bidirectional Transceivers With PAM-4 Forward and PAM-2 Back Channels for 5-m Automotive Camera Link

2022 IEEE Symposium on VLSI Technology and Circuits (VLSI Technology and Circuits) Pub Date : 2022-06-12 DOI:10.1109/vlsitechnologyandcir46769.2022.9830299

Yunhee Lee, Woonghee Lee, Minkyo Shim, Soyeong Shin, Woo-Seok Choi, D. Jeong

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引用次数: 4

Abstract

This paper presents asymmetric simultaneous bidirectional (SBD) transceivers for the next-generation automotive camera link. To realize the SBD operation with the PAM-4 signaling, the proposed wide linear range (WLR) hybrid excludes the voltage-dependent non-linear transconductance (gm) of active elements. A two-step hybrid strategy suppressing the PAM-4 forward channel (FC), including the FFE, is utilized for low power and design simplicity. A Σα hybrid removes only four primary DC levels, and 2nd order gm-capacitor (gmC) low-pass filter (LPF) filters out residual/echoes from the hybrid/channel. An echo canceller (EC) technique is also employed to further reduce the reflections of the PAM-2 back channel (BC). The highly asymmetric SBD transceivers with 12-Gb/s PAM-4 FC and 125-Mb/s PAM-2 BC achieve BER<10-12 over 5-m cable (15.9 dB loss). Prototype chips fabricated in 40-nm technology consume 78.4 mW, exhibiting an FoM of 0.41 pJ/b/dB.

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0.41 pj /b/dB非对称同时双向收发器，PAM-4前向和PAM-2后向通道，用于5米汽车摄像头链路

介绍了用于下一代汽车摄像头链路的非对称同步双向(SBD)收发器。为了实现PAM-4信号的SBD操作，所提出的宽线性范围(WLR)混合电路排除了有源元件的电压相关非线性跨导(gm)。两步混合策略抑制PAM-4前向信道(FC)，包括FFE，用于低功耗和设计简单。Σα混合电路只去除四个主直流电平，而二阶gm-电容器(gmC)低通滤波器(LPF)滤除混合电路/通道中的残留/回波。回波消除(EC)技术也被用于进一步减少PAM-2反向信道(BC)的反射。具有12gb /s PAM-4 FC和125mb /s PAM-2 BC的高度非对称SBD收发器在5m电缆(15.9 dB损耗)上实现BER<10-12。采用40纳米技术制造的原型芯片功耗为78.4 mW, FoM为0.41 pJ/b/dB。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2022 IEEE Symposium on VLSI Technology and Circuits (VLSI Technology and Circuits)

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