Design and Research of 5.8GHz Microwave Low Noise Amplifiers

• Main Authors: Kung-Hsin Cheng, 鄭功鑫
• Other Authors: 沈自
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/98315168687897217456

碩士 === 亞東技術學院 === 資訊與通訊工程研究所 === 93 === Wireless communication system is general and popular recently. Thus, the design and research of the RF front end circuit in different communication systems is very important. The low noise amplifier (LNA), whose main function is to provide enough gain to overcome the noise of subsequent stages, is one of the key components in all kind of receiver architectures. Aside from providing this gain while adding as little noise as possible, an LNA should accommodate large signals without distortion, and frequently must also present a specific impedance, such as 50 ohm, to the input source. In the thesis, we design and implement the low noise amplifier. This thesis has been divided into two parts. In the first part, we tried to make a study of the Full Two Port calibration and TRL calibration. For all the calibration methods, TRL is the simplest one and their standard calibration kits could be easily fabricated. Therefore TRL calibration is often used for on-wafer measurements and de-embedding the effect of test fixtures. The second part included two LNA designs. First of all, a 5.8 GHz common source low noise amplifier. At 5.8 GHz, the measured power gain of this LNA is 9.22 dB, the input return loss of -20.76 dB, output return loss of -15.95 dB, reverse isolation of -17.86 dB, noise figure of 4.35 dB. The other LNA is a 5.8 GHz cascode low noise amplifier. Cascode topologies of the low noise amplifiers are quietly popular for the wireless communication system. At 5.8 GHz, the measured power gain of this LNA is 6.75 dB, the input return loss of -14.64 dB, output return loss of -13.13 dB, reverse isolation of -20.19 dB, noise figure of 3.59 dB.