TY - GEN
T1 - A 50-Gbaud Low-Noise CMOS Stacked Differential Difference TIA for Coherent Optical Receiver
AU - Wei, Wenwen
AU - Zhao, Liang
AU - Ran, Nianquan
AU - Yang, Ruixuan
AU - Ma, Shuaizhe
AU - Zhang, Chaoxuan
AU - Gui, Xiaoyan
AU - Geng, Li
AU - Li, Dan
N1 - Publisher Copyright:
© 2025 IEEE.
PY - 2025
Y1 - 2025
N2 - This paper presents a new type of differential difference (DD) transimpedance amplifier (TIA) for coherent optical receivers. On top of the intrinsic differential signaling of the coherent receiver, the proposed TIA further reuses the signal current and receives differential signals from each individual photodiode (PD), forming a DD-TIA and achieving an input-referred noise (IRN) of √2 times better than that of a conventional coherent TIA. Through voltage domain stacking of the two differential TIAs, distinct PD biasing of cathode/anode and differential signaling are achieved. Fabricated in 28-nm CMOS process, the proposed TIA achieves a transimpedance gain of 71 dBΩ, a 3-dB bandwidth of 26 GHz, and an IRN density of 6.9 pA/√Hz. High-quality PAM-4 eye diagrams in 50 GBaud are also demonstrated. To the authors' best knowledge, this is the first differential TIA that reuses the cathode photocurrent of PDs for coherent detection.
AB - This paper presents a new type of differential difference (DD) transimpedance amplifier (TIA) for coherent optical receivers. On top of the intrinsic differential signaling of the coherent receiver, the proposed TIA further reuses the signal current and receives differential signals from each individual photodiode (PD), forming a DD-TIA and achieving an input-referred noise (IRN) of √2 times better than that of a conventional coherent TIA. Through voltage domain stacking of the two differential TIAs, distinct PD biasing of cathode/anode and differential signaling are achieved. Fabricated in 28-nm CMOS process, the proposed TIA achieves a transimpedance gain of 71 dBΩ, a 3-dB bandwidth of 26 GHz, and an IRN density of 6.9 pA/√Hz. High-quality PAM-4 eye diagrams in 50 GBaud are also demonstrated. To the authors' best knowledge, this is the first differential TIA that reuses the cathode photocurrent of PDs for coherent detection.
KW - Coherent
KW - low noise
KW - stacked differential optical receiver
KW - transimpedance amplifier (TIA)
UR - https://www.scopus.com/pages/publications/105034649260
U2 - 10.1109/ICTA68203.2025.11329661
DO - 10.1109/ICTA68203.2025.11329661
M3 - 会议稿件
AN - SCOPUS:105034649260
T3 - 2025 IEEE 8th International Conference on Integrated Circuits, Technologies and Applications, ICTA 2025
SP - 147
EP - 148
BT - 2025 IEEE 8th International Conference on Integrated Circuits, Technologies and Applications, ICTA 2025
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2025 IEEE 8th International Conference on Integrated Circuits, Technologies, and Applications, ICTA2025
Y2 - 22 October 2025 through 24 October 2025
ER -