| With rapid development of the wireless communication, higher-performance Microwave/RF devices and systems are required. Considering both low noise amplifiers (LNA) and microstrip filters play important roles in the wireless communication system, this paper mainly studies design, making and testing of the two devices.This paper firstly presents the relative theory on the LNA, and then describes the design method of the LNA in details on the basis of classical microwave theory and modern advanced EDA tools. DC bias,stability analysis,matching design,making and debugging of layout are emphatically described. A narrowband low noise amplifier working in the frequency range 1.7～1.9GHz is designed and made with ADS software of Agilent Company. The noise figure (NF) of 0.9 dB, gain of 22 dB, and in-band flatness of 0.5dB can be obtained from the testing results. The results indicate that this low noise amplifier meets the technical requirements, furthermore low-temperature tests are made at 77K. In addition, the shunt negative feedback is analyzed, and a low noise amplifier operating in 0.8GHz~2GHz is developed employing the usual design methods of broadband amplifier. The amplifier gain, in-band flatness are measured to be 23 dB and 1.3 dB respectively, and the input-output power matching is better than -11 dB.This paper also simply introduces the basic theory of microstrip filters, and a fifth-order microstrip filter is designed based on the parameter-extracting method and the group delay method. The layout designs and simulations are performed with Genesys2006 and Sonnet. Making,assembling, testing and debugging of the filter are finally completed.At last, the designs and simulations of high temperature superconducting (HTS) RF receiver front-end are presented briefly. It is valuable for further optimizing HTS RF receiver front-end. |
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