用于千兆以太网模拟接收前端的预均衡电路  

Pre-equalizer for 1000BaseT Ethernet Transceiver

作　　者：卜涛[1] 嵇楚[1] 叶凡[1] 许俊[1] 任俊彦[1] 

机构地区：[1]复旦大学专用集成电路与系统国家重点实验室,上海200433

出　　处：《微电子学与计算机》2004年第6期160-163,共4页Microelectronics & Computer

基　　金：国家863计划项目(2002AA1Z1360)

摘　　要：文章采用0.18滋m/3.3V1P6M标准CMOS工艺设计实现了用于千兆(1000BaseT)以太网模拟接收前端的预均衡电路。电路由基带漂移补偿电路和可变增益放大器两部分组成。基带漂移补偿电路补偿了由于变压器的高通特性引起的信号基带漂移现象,调整范围从1.75V到2.25V。可变增益放大器除了具有变化范围从1.3到5、共15档的常规增益可调功能外,还具有带宽65MHz的低通滤波特性和共5档的高频补偿功能,版图后仿真结果表明所设计电路完全达到了千兆以太网的系统要求,很好地实现了对输入信号的模拟预均衡处理。A pre-equalization circuit for the analog front-end circuit of the 1000Base-T Ethernet transceiver implemented by 0.18μm/3.3V 1P6M CMOS technology is presented. The circuit is composed of a baseline wanderer 'canceller' and a VGA (Variable Gain Amplifier). The baseline wanderer 'canceller' can correct baseline wander caused by the transformer and adjust input signals ranging from 1.75V to 2.25V. The VGA has 15 selectable gain levels as well as 5 levels of high frequency compensation. It can also function as a low-pass filter with 65MHz bandwidth. Post-layout simulation results indicate that the presented circuit can fully satisfy the system requirement of the 1000BaseT Ethernet and pre-equalize input signals very well.

关 键 词：可变增益放大器 基带漂移 千兆以太网 

分 类 号：TN4[电子电信—微电子学与固体电子学]