From simple Power Amplifiers and LNAs to complete Transceivers and Systems, testing is accomplished through a universal test Head interface.

从简单的功率放大器和低噪声放大器到完整的收发器与系统，通过一个通用测试头接口就可以完成测试。

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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。

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In chapter three, the designation and application of the low noise amplifiers (LNA) are optimized, and two different LNAs circuits and their cascade connection are both studied.

第三章为低噪声放大器优化设计与应用，设计和实现了两种不同低噪放电路并且对其级联方式进行了研究。

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