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如果知道或可以估计出一款低噪声放大器的增益或噪声带宽,只使用几只电阻和一只交流电压表,就可以测出其它的规格(参考文献1)。本例使用了Johnson方程,它描述的是一只电阻所生成的噪声量(参考文献
If you know or can estimate the gain or noise bandwidth of a LNA, use only a few resistors and an AC voltmeter to measure other specifications (Reference 1). This example uses the Johnson equation, which describes the amount of noise generated by a resistor (references