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A 3-Tap FIR Filter With Cascaded Distributed Tap Amplifiers for Equalization Up to 40 Gb/s in 0.18-/22m CMOS
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 prototype is 1m m 1 mm (900 m 600 m active area) and consumes up to 70 mW from a 1.8-V supply depending on the tap gains. Linear equalization is demonstrated over a channel with 17 dB of loss at 20 GHz. A 50 mV per side eye amplitude with 14 dB signal-to-noise ratio is demonstrated at 30 Gb/s, and a modest 39 mV per side eye amplitude with 10 dB signal-to-noise ratio is achieved at 40 Gb/s.