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首页> 外文期刊>Microwaves, Antennas & Propagation, IET >EVM measurements using orthogonal separation at the output of a non-linear amplifier
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EVM measurements using orthogonal separation at the output of a non-linear amplifier

机译：在非线性放大器的输出端使用正交分离进行EVM测量

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摘要

A method is developed to obtain the error vector magnitude (EVM) of non-linear amplifiers by mean of orthogonalising the output of the amplifier to extract its uncorrelated non-linear terms. This method allows for extraction of in-band distortion power and spectral regrowth power from the measured RF waveforms which provides invaluable insight to the EVM behaviour of the device. From a frequency domain analysis, the EVM is attributed to the in-band distortion power and spectral regrowth power where it is determined that the in-band distortion power contributes more to the EVM degradation. The amplifier used for verification is modelled from Avago??s MGA83563 measured amplitude distortion (AM?? AM) and phase distortion characteristics (AM-PM). Finally, the relationship between EVM and gain compression characteristic is derived from the proposed orthogonal model.
机译：通过正交化放大器的输出以提取其不相关的非线性项，开发了一种获得非线性放大器的误差矢量幅度（EVM）的方法。这种方法允许从测量的RF波形中提取带内失真功率和频谱再生成功率，从而为设备的EVM行为提供了宝贵的见识。从频域分析来看，EVM归因于带内失真功率和频谱再生功率，在此确定带内失真功率对EVM的劣化贡献更大。用于验证的放大器是根据Avago的MGA83563测得的幅度失真（AM ?? AM）和相位失真特性（AM-PM）建模的。最后，从提出的正交模型推导了EVM与增益压缩特性之间的关系。

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