为了在DVB-IP网关中实现性能优良的ASI环出电路,提出了一种DVB-IP网关中ASI环出电路的实现方法。该方法以PE-65508差分转换芯片、CLC014高速自适应均衡器芯片与CLC006高速电缆驱动芯片为基础,不仅结构简单,还实现了270Mbps ASI码流的环出。先介绍了ASI与SPI的特点,接着详细阐述了ASI环出功能的具体电路工作原理,最后给出了测试结果。该ASI环出电路具有约1.8倍的放大性能,不但环出能力强,而且完全适用于环出后的再传输与多级环出的应用。

An implementation of the ASI loop output circuit in the DVB-IP gateway is introduced.The implementation which simply realizes the loop output of 270Mbps ASI transport stream is based on the chip PE- 65508,CLC014 and CLC006.The paper first mentions the features of ASI and SPI,then describes the circuit in detail, and gives out the test result at last.In the test,the loop output signal is amplified by 1.8 times.The loop output function is so strong that it can meet the requirements of re-transport after loop output and multilevel loop output.