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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 (OP 1−dB ) is presented to describe the design of the linearity optimization in CS cascode LNA. The |S 21 | 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 quadrupleband 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.

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