Improvement of Transmit Data Bit Rate and Characteristic of Optical Modulator Driver Circuit by Cascode HBT
用新的电路形式提高HBT光调制器驱动电路的传输速率及性能

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.