Abstract
A concurrent multi-band low-noise amplifler (LNA) for both WLAN and WiMAX applications covering 2.4{2.7GHz, 3.3{ 3.8GHz and 5.1{5.9GHz is mainly investigated. The proposed LNA consists of two cascaded common-source stages and employs stepped- impedance transformers and series and shunt feedback techniques to obtain good return loss, low noise and high linearity simultaneously. Test results show that the LNA features input and output return loss of 12dB, gain of 21dB, and noise flgure of 2dB across the three bands of operation, which are the state of the art among the counterparts.
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