多媒体终端电路设计及信号完整性分析

Design of the multimedia terminal circuit and analysis of the signal integrity

使用DSP加FPGA结构设计了多媒体终端电路,具有两路复合视频输入,一路VGA和复合视频可选输出,以太网通信和立体声音频输入输出等功能。根据信号完整性理论和项目要求对PCB进行了合理布局布线,对PCB上的高速信号进行了反射、串扰等信号完整性分析,通过使用串接电阻和调整信号走线等对电路进行优化。经测试,设计的电路功能完备,性能可靠,达到了预期设计要求。

A multimedia terminal circuit based on DSP and FPGA was designed.The circuit function consisted of two channels of composite video input,one channel of selectable output of VGA and composite video,ethernet communication and stereo input and output.According to the SI theory and project requirement,rational layout and lining were made.The SI analysis including reflection and crosstalk was done with the high speed signal.The topological structure was adjusted and the circuit was optimized by using series resistor and modifying the layout.From experiments,the circuit has fully functions and reliable performance,and achieves the expected design requirements.