A Nevv Method of Third-Order Intermodulation Reduction in Nonlinear Microwave Systems
A Nevv Method of Third-Order Intermodulation Reduction in Nonlinear Microwave Systems
复制标题
非线性微波系统三阶互调抑制的新方法
DOI：
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发表时间：
1986
期刊：
影响因子：
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通讯作者：
J. Obregon
中科院分区：
文献类型：
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作者：
Yongcai Hu;J. Mollier;J. Obregon
用Vollterra级数分析了几种微波系统的三阶互调失真(IMD(3))。本文用非线性FET模型计算的理论结果表明，当反馈的幅值和相位选择正确时，两个输入信号在f/sub1/和f/sub2/处的三阶互调产物可以减小几个数量级(实际上，理论上IMD(3)应该减小到零)，而低频反馈在f/sub1/-f/sub2/处。为了验证这一预测，实现了一个电路，并在单级FET放大器上进行了测量。初步结果证实了我们的分析。实验测量表明，该方法使互调产物减少了12分贝。
Third-order intermodulation distortion (IMD (3)) of some microwave systems has been analyzed using Vollterra series. In this paper, theoretical results which have been calculated with a nonlinear FET model show that third-order intermodulation prodgcts of two input signals at f/sub 1/ and f/sub 2/ can be reduced by several orders of magnitude (in fact, theoretically, IMD (3) should be reduced to zero), with a low-frequency feedback at f/sub 1/- f/sub 2/, when the amplitude and the phase of this feedback are correctly chosen. To verify this prediction, a circuit has been realized and measurements have been made on a one-stage FET amplifier. First results confirm our analysis. Experimental measurements show a 12-dB decrease of intermodulation products with our method.