测量系统采用了微波信号源、低噪声放大器和微波检波器等组成微波电路单元。
The microwave circuit unit is composed of microwave signal resource, low noise amplifier and microwave detector.
在低噪声放大器噪声线性的基础上，介绍了负载温度可变法，用于测量低温低噪声放大器的噪声。
On the basis of the noise linearity of low noise amplifier(LNA), the variable load temperature method is introduced to measure noise properties of cryogenic LNAs.
在低噪声放大器噪声线性的基础上，介绍了负载温度可变法，用于测量低温低噪声放大器的噪声。
On the basis of the noise linearity of low noise amplifier(LNA), the variable load temperature method is introduced to measure noise properties of cryogenic LNAs.
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