一种用于视频传输的0.4～2.4 Gbps双线双向收发电路设计及实现

Design and Implementation of a 0.4～2.4 Gbps Bi-directional Transceiver for Video Transmission

利用0.18μm MixRF CMOS工艺,设计了一种用于车载辅助驾驶系统的新型双向互收发电路。收发电路采用频分复用方式,在同一对差分铜互联传输通道上,同时进行双向数据无干扰实时收发。前向通道利用电流模逻辑驱动器发送高速数据,同时并行低通滤波器滤除本地高频信号,实现低速接收;后向通道在实时发送低速控制信息的同时,利用高通滤波器滤除本地低频信号,实现高速接收。测试结果显示,该电路可在不同长度、不同类型的铜质传输线[1 016mm(40英寸)印制电路板、6m2.0标准通用串行总线线缆、8m6类双绞线缆],进行高速数据0.4~2.4Gbps及低速2~4 Mbps控制数据双向实时传输。

A new type of bi-directional transceiver for vehicle-assisted driving system was designed in a 0.18μm MixRF CMOS technology.Data can be transmitted bi-directionally in the same pair of differential copper channel using FDM（frequency division multiplexing）mode,at the same time two-way data transmitted real-time without interference.In forward channel highspeed data is send using CML drive,while low-speed receiving is obtained using parallel LPF filter to filtrate local high-frequency signal.In backward channel low-speed control information is send,while high-speed receiving is obtained using HPF filter to filtrate local low-frequency signal.Lab measurement shows in different kinds of copper channel with different lengths,such as 1016 mm（40 inch）FR4,6 m USB 2.0 cable,8 mCAT6 cable,the circuit operate well at the speed of 0.4-2.4 Gbps in forward channel and 2-4 Mbps in backward channel,simultaneously.