PAM4 baseband demodulation circuit for mmWave communication

Sheng Xie; Shaorong Lu; Ruiliang Song; Luhong Mao; Naibo Zhang; Kaixue Ma

doi:10.1117/12.2661633

12 April 2023 PAM4 baseband demodulation circuit for mmWave communication

Sheng Xie, Shaorong Lu, Ruiliang Song, Luhong Mao, Naibo Zhang, Kaixue Ma

Proceedings Volume 12565, Conference on Infrared, Millimeter, Terahertz Waves and Applications (IMT2022); 125650M (2023) https://doi.org/10.1117/12.2661633
Event: Conference on Infrared, Millimeter, Terahertz Waves and Applications (IMT2022), 2022, Shanghai, China

Abstract

High speed data links with low jitter and large bandwidth are essential for millimeter-wave (mmWave) communications. In this paper, an analog-domain 4-level pulse amplitude modulation (PAM4) baseband demodulation circuit with low data jitter and ultrahigh data rate was designed. In order to suppress the jitter caused by inter-symbol interference (ISI), a local feedback loop was introduced to extend the bandwidth of threshold slicer. A novel clock and data recovery (CDR) circuit architecture was proposed and optimized to extract the clock pulses with low jitter, thus improving the recovered data quality. A symmetric decoder performs an XOR logic operation to recover the least significant bit (LSB) of PAM4 signal, while the most significant bit (MSB) can be directly obtained from the middle-lane after retiming. The whole demodulation circuit was optimized based on IHP 130nm SiGe BiCMOS technology, and the simulation results indicate that our designed circuit can decode single-channel 50 Gbit/s PAM4 data streams into two 25 Gbit/s NRZ signals, and the peak-to-peak jitter is less than 0.1 UI.

Citation Download Citation

Sheng Xie, Shaorong Lu, Ruiliang Song, Luhong Mao, Naibo Zhang, and Kaixue Ma "PAM4 baseband demodulation circuit for mmWave communication", Proc. SPIE 12565, Conference on Infrared, Millimeter, Terahertz Waves and Applications (IMT2022), 125650M (12 April 2023); https://doi.org/10.1117/12.2661633

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