A design method for wide-band CMOS low noise amplifier (LNA) is presented, which is suitable for mobile TV application. The proposed method integrates two kinds of wide-band LNA topologies by different switches, which can achieve better performance and avoid shortcomings when it operates at different modes. It can save the power consumption and improve the linearity at higher input signal power, and it also can reduce the noise at lower input signal power. The proposed wide-band LNA topology for mobile TV application is designed in TSMC 0.18-µm RF CMOS process.