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JSSC 2006第8期Wireline I/O0.18μmEqualizer

A 3-Tap FIR Filter With Cascaded Distributed Tap Amplifiers for Equalization Up t

本文介绍了一种用于40Gb/s长距离单模光纤链路偏振模色散补偿的3抽头FIR滤波器。
0.18μm CMOS, 1.8V, 70mW, 30Gb/s (50mV, 14dB SNR), 40Gb/s (39mV, 10dB SNR)
FIR滤波器偏振模色散补偿分布式放大器LC梯形网络线性均衡
▸采用级联分布式放大器实现可调抽头增益
▸利用集总LC梯形网络同时提供25ps抽头延迟和分布式放大器的人工传输线
▸在17dB损耗的20GHz信道上实现线性均衡
Abstract
This paper describes a 3-tap finite impulse response programmable analog filter in 0.18- m CMOS. The filter is in- tended for polarization-mode dispersion compensation in 40-Gb/s long-haul single-mode optical fiber links. A novel filter topology is employed, whereby each tap gain comprises a cascade of two dis- tributed amplifiers with adjustable gain. The same lumpedLC lad- ders that provide the 25-ps tap delays also serve as artificial trans- mission lines for the distributed tap amplifiers. The prot