Modified photodiode equivalent circuit model considering coplanar waveguide electrodes

等效电路 光电二极管 带宽(计算) 共面波导 计算机科学 电子工程 电阻抗 软件 电极 材料科学 光电子学 物理 工程类 电压 电信 电气工程 微波食品加热 量子力学 程序设计语言
作者
Tonghui Li,Xiaofeng Duan,Gongqing Li,Ke Li,Weifang Yuan,Kai Liu,Yongqing Huang
出处
期刊:Semiconductor Science and Technology [IOP Publishing]
卷期号:38 (8): 085011-085011 被引量:1
标识
DOI:10.1088/1361-6641/acdc48
摘要

Abstract Accurate equivalent circuit models can assist in better analyzing the performance of photodetectors. This study proposes a modified photodiode (PD) equivalent circuit model that considers coplanar waveguide (CPW) electrodes. First, the CPW electrodes of the PD are analyzed using high-frequency structure simulation software and advanced design simulation software. Skin effect occurs inside the electrode at high frequencies, increasing the PD loss and reducing the bandwidth. Subsequently, the extraction formula for the proposed model is derived, and the proposed model is compared with two conventional CPW electrode models. The proposed model effectively eliminates the frequency-dependency issue in the parameter extraction process of previous models, thereby demonstrating its accuracy. Furthermore, simulation and experimental results validate the reliability of the proposed model. Among the entire frequency band, the proposed model has good stability and a low error rate and can achieve excellent fitting with the measured results. Compared with previous studies, the average error rate is reduced by over 10%, demonstrating a significant improvement. Finally, the influence of the skin effect and high-impedance transmission lines on PD performance is analyzed and a viable approach to improve the bandwidth of PDs is proposed. The proposed model provides a viable approach to model and optimize CPW structures and is significant for the design of high-performance PDs.
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