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A 100-Gb/s PAM-4 Optical Receiver With 2-Tap FFE and 2-Tap Direct-Feedback DFE in 28-nm CMOS
一款集成2抽头FFE和2抽头直接反馈DFE的100Gbps PAM-4光接收器
28nm CMOS, 100Gb/s, -8.9dBm灵敏度@2.4e-4 BER, 3.9pJ/bit能效
光接收器PAM-4CMOS前馈均衡判决反馈均衡
▸低噪声亚奈奎斯特带宽TIA
▸混合信号采样器集成2抽头FFE和DFE
▸分布式电流积分求和器满足50Gbaud反馈延迟需求
Abstract
Optical receivers (ORXs) with integrated CMOS electronics enable compact, low-power solutions for 400-G Eth- ernet and co-packaged optics. In this article, we present a 100-Gb/s PAM-4 ORX with TIA and sampler integrated into a single 28-nm CMOS IC. ORX sensitivity is optimized using a low noise, sub-Nyquist bandwidth TIA followed by a mixed signal sampler that includes 2-tap FFE and 2-tap DFE. A distributed current-integrating summer helps meet feedback latency requirements of 50-Gbaud direct-feedback PAM-4 DFE. Measurements characterizing the CMOS linear TIA indicate ∼23-GHz trans-impedance (ZT) bandwidth (BW) with-2.5 µA rms input-referred noise. Optical measurement results at 100 Gb/s show that −8.9-dBm sensitivity is achieved at 2.4e-4 BER with 3.9-pJ/bit energy efficiency.