| Citation: |
Miao Ang, Li Yiqun, Wu Qiang, Cui Hailin, Huang Yongqing, Huang Hui, Ren Xiaomin. Small-Signal Equivalent Circuit Modeling of a Photodetector Chip[J]. Journal of Semiconductors, 2007, In Press.
Miao A, Li Y Q, Wu Q, Cui H L, Huang Y Q, Huang H, Ren X M. Small-Signal Equivalent Circuit Modeling of a Photodetector Chip[J]. Chin. J. Semicond., 2007, 28(12): 1878.
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Small-Signal Equivalent Circuit Modeling of a Photodetector Chip
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Abstract
A small-signal equivalent circuit model and the extraction techniques for photodetector chips are presented.The equivalent lumped circuit,which takes the main factors that limit a photodetector's RF performance into consideration,is first determined based on the device's physical structure.The photodetector's S parameters are then on-wafer measured,and the measured raw data are processed with further calibration.A genetic algorithm is used to fit the measured data,thereby allowing us to calculate each parameter value of the model.Experimental results show that the modeled parameters are well matched to the measurements in a frequency range from 130MHz to 20GHz,and the proposed method is proved feasible.This model can give an exact description of the photodetector chip’s high frequency performance,which enables an effective circuit-level prediction for photodetector and optoelectronic integrated circuits. -
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