设计并实现了用于光纤用户网和千兆以太网光接收机的CMOS前置放大器 .电路采用共栅结构取代常用的共源结构 ,大大降低了输入电阻 ,使得光检测器的寄生电容只影响非主极点 ,从而获得宽带 .提出了一种优于电阻反馈的有源反馈 ,可获得比普通共栅结构更宽的带宽 .测试结果表明 ,在输入 80 5 μA的光电流时 ,电路的单端输出电压摆幅大于 64mV(峰 峰值 ) ,均方根抖动在 36ps以下 ,可稳定工作在 1 2 5Gbit/s的速率上 . Design and implementation of CMOS preamplifier for fiber optic subscriber network and gigabit Ethernet optical receiver.The circuit adopts a common gate structure to replace common common source structure and greatly reduces the input resistance so that the photodetector only affects the parasitic capacitance Non-main pole, so as to obtain broadband.An active feedback that is superior to the resistance feedback is proposed to obtain a wider bandwidth than the common common-gate structure.The test results show that when a 805 μA photocurrent is input, Terminal output voltage swing greater than 64mV (peak-to-peak), rms jitter below 36ps, stable operation at a rate of 125Gbit / s.