A Reconfigurable CMOS Low Noise Amplifier for Wireless LAN Applications

This paper presents the designed and implemented CMOS Low Noise Amplifier (LNA) for multiband operation in TSMC 0.18 ㎛ process. To operate in multibands and multistandards, switched inductor and switched capacitor array are used in input and output signal paths. Due to filtering characteristic of input stage, the LNA can suppress spurious signal effectively. The designed reconfigurable LNA is targeted to IEEE 802.11n application which operates in dual band: 2.4~2.485 ㎓ and 5.15~ 5.825 ㎓. At each frequency mode; 2.4 ㎓, 5.25 ㎓ and 5.75 ㎓, gains are more than 12 ㏈ while NFs are kept less than 2.2 ㏈. The LNA can be optimized the performance to each operation frequency by using LC resonant circuits and capacitor array networks.