A Broad-Bandwidth Cascode-Feedback Transimpedance Amplifier for Short-Range Optical Communication

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First Author:X. Zhang

Correspondence Author:Z. Lu*

Co-author:, W. Zhu, W. Yuan, Y. Zhao, G. Yu, Y. Yu, and C. Wang

Journal:EEE 5th International Conference on Circuits and Systems (ICCS 2023)

Included Journals:EI

Discipline:Engineering

First-Level Discipline:电子科学技术

Document Type:C

DOI number:10.1109/ICCS59502.2023.10367222

Abstract:Recently, demands in short-range optical communications with high integration are increasing very fast, and transimpedance amplifiers (TIAs) play a significant role in optical communication systems. This paper presents a broad-bandwidth TIA, which investigates the design strategy of the regulated cascode (RGC) TIA under low supply voltage. The proposed TIA includes a cascode-feedback RGC input stage with transistors working in weak inversion to achieve an optimized trade-off among bandwidth, low supply, power consumption and noise. Capacitive degeneration is used to further extend the bandwidth. In 40-nm CMOS, the proposed TIA under 1.2 V can achieve a -3dB bandwidth of 8.65 GHz with 0.25 pF photodiode capacitance and 0.15 pF load capacitance. The total input-referred noise current is 2.47 μA. The core TIA occupies 0.003 while the DC power consumption is 2.46 mW without the output buffer. Compared with related TIA works, the proposed TIA achieves comparable bandwidth performance and a 2×~3.5× figure of merit enhancement.

Links to published journals:https://ieeexplore.ieee.org/document/10367222