4-Channel Push-Pull VCSEL Drivers for HDMI Active Optical Cable in 0.18-μm CMOS

Jeongho Hwang, Hong-Seok Choi, H. Do, Gyu-Seob Jeong, Daehyun Koh, Seong Ho Park, D. Jeong
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Abstract

The price and power consumption of standard HDMI cables exponentially rise when the data rate increases or cable runs longer. HDMI active optical cable (AOC) can potentially solve price and power issues since fibers are tolerant to loss. However, additional optical components such as vertical-cavity surface-emitting laser (VCSEL) and photodiode (PD) are required. Therefore, drivers and transimpedance amplifiers should be designed carefully for normal operations. In this paper, two types of 4-channel VCSEL drivers for HDMI AOC are presented. The first type of the driver passes data and bias separately. It uses off-chip capacitors for AC coupling. On the other hand, the second type of the driver passes data including DC value without using off-chip capacitors. Structures of the both drivers are based on push-pull current-mode logic (CML) to achieve better power efficiency. Drivers fabricated in 0.18-μm CMOS process consume 36.5 mW/channel at 6 Gb/s and 24.7 mW/channel at 12 Gb/s, respectively.
用于HDMI有源光缆的0.18 μm CMOS 4通道推挽式VCSEL驱动器
当数据速率增加或电缆运行时间延长时,标准HDMI电缆的价格和功耗将呈指数级增长。HDMI有源光缆(AOC)可以潜在地解决价格和功率问题,因为光纤可以容忍损耗。然而,需要额外的光学元件,如垂直腔面发射激光器(VCSEL)和光电二极管(PD)。因此,驱动器和跨阻放大器应仔细设计,以保证正常运行。本文介绍了两种用于HDMI AOC的4通道VCSEL驱动程序。第一种驱动分别传递数据和偏置。它使用片外电容进行交流耦合。另一方面,第二种类型的驱动器传递包括直流值在内的数据,而不使用片外电容器。这两个驱动器的结构都基于推挽电流模式逻辑(CML),以实现更好的功率效率。采用0.18 μm CMOS工艺制造的驱动器在6gb /s和12gb /s下的功耗分别为36.5 mW/channel和24.7 mW/channel。
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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