This　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　(OP1-dB)　is　presented　to　describe　the　design　of　the　linearity　optimization　in　CS　cascode　LNA.　The　vertical　bar　S-21　vertical　bar　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.