摘要
在传统光调制器驱动电路中 ,所用 HBT截止频率的大小要达到驱动电路传输速率的 4倍以上 .文中在输出级采用共射共基 HBT形式后 ,其器件的截止频率只需大于电路传输速率的 2倍即可 ,从电路设计的角度降低了对所用器件的要求 .文中分析了新的电路结构提高传输速率的原因并给出了模拟结果 .同时新的电路结构也具有良好的热稳定性 .
or:In generally,the transistor technology chosen must provide the cut-off frequency f T better than four times the bit rate of the network in order to achieve the required speeds and proper system margins.A novel cascode circuit reduces the cut-off frequency requirement to twice the bit rate.The reason why the transmit data bit rate of the cascode HBT circuit rises is analyzed.At the same time,the novel cascode circuit also provided an effective solution to the thermal runaway issue.
基金
国家重点基础研究发展规划资助项目 (编号 :G2 0 0 0 0 6 830 40 3)~~
