paper　presents　a　quadruple-band　low　noise　amplifier　(LNA)　which　utilizes　a　differential　pair　common-source　(CS)　cascode　amplifier　to　drive　a　LC-Tank　loading.　The　capacitors　array　are　parallel　with　the　LC-Tank　to　implement　the　central　frequency　selection.　The　band-selection　switch　employs　the　binary　voltage　controlling　to　alter　the　equivalent　capacitance　of　capacitors　array　of　the　loading　LC-Tank,　which　results　in　the　central　frequency　of　the　LNA　is　switched.　The　body　self-biasing　technique　is　designed　to　minimize　the　noise　contribution　caused　by　the　body　effect　of　the　MOS　devices.　In　addition,　the　analysis　of　the　transistors　dimension　ratio　versus　output　referred　1-dB　compression　point　(OP　_{1-dB}　)　is　presented　to　describe　the　design　of　the　linearity　optimization　in　CS　cascode　LNA.　The　S21　is　16.8,　16.63,　16.78,　16.39　dB　at　2.35,　2.4,　2.45,　2.55　GHz,　respectively.　The　noise　figure　(NF)　is　under　2.75　dB　between　the　quadruple-band　mode.　This　proposed　LNA　is　simulated　by　55　nm　RF　CMOS　process　and　consumes　3.75　mW　excluding　output　buffer　from　1.25　V　supply.　©　2013　IEEE.