Broadband Predistortion Circuit Using Zero Bias Diodes for Radio Over Fiber Systems
Broadband Predistortion Circuit Using Zero Bias Diodes for Radio Over Fiber Systems
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DOI：
10.1109/lpt.2013.2281409
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发表时间：
2013-10
影响因子：
2.6
通讯作者：
R. Zhu;Xiupu Zhang;B. Hraimel;Dongya Shen;Taijun Liu
中科院分区：
文献类型：
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作者：
R. Zhu;Xiupu Zhang;B. Hraimel;Dongya Shen;Taijun Liu
设计了一种低成本的宽带模拟预失真电路（PDC），并在光纤无线电（RoF）系统中进行了实验验证。为了减小PDC的尺寸和寄生效应，提出了一种微型混合微波集成电路技术。PDC中仅使用两个零偏置GaAs梁式引线探测器二极管和电容器。由于零偏置特性，二极管可以被偏置，从而降低功耗。由于零偏置二极管的高串联电阻，不需要宽带匹配网络。使用RoF系统的线性化性能进行评估，没有和PDC。结果表明，PDC在7 ~ 18 GHz范围内使输入1 dB压缩功率提高了0.4-2.2 dB，无杂散动态范围在7 ~ 14 GHz范围内提高了~ 10 dB，在15 ~ 18 GHz范围内提高了~ 6 dB，但受五阶非线性失真的限制。
A low-cost broadband analog predistortion circuit (PDC) is designed and experimentally verified in a radio over fiber (RoF) system. A miniature hybrid microwave integrated circuit technique is used to reduce the size and parasitics of PDC. Only two zero bias GaAs beam lead detector diodes and capacitors are used in the PDC. The diodes can be biased at due to zero bias characteristic so that power consumption is reduced. No broadband matching network is required because of high series resistance of the zero bias diodes. The linearization performance is evaluated using an RoF system without and with the PDC. It is shown that the PDC improves the input 1-dB compression power by 0.4-2.2 dB from 7 to 18 GHz; and spurious free dynamic ranges are improved by ~ 10 dB from 7 to 14 GHz and ~ 6 dB from 15 to 18 GHz, limited by fifth order nonlinear distortion.