A RF CMOS low noise amplifier for WiMAX applications

In this paper, a radio frequency (RF) CMOS low noise amplifier (LNA) for WiMAX applications is presented. In this amplifier, it is used a high-Q active inductor with band selector and a differential output configure to operate at three different frequency bands and obtain low noise figure (NF), high enough power gain, and low power consumption. Using TSMC 0.18 mum process, the proposed amplifier can be simultaneously operated multi-band at 2.6 GHz, 3.6 GHz, and 5.5 GHz for WiMAX applications. Simulation results show that the proposed LNA have the forward gain of 35.7 dB, 33.4 dB, and 17 dB, the IIP3 of -11.6 dBm, -7 dBm, and -9 dBm, the noise figure of 1.2 dB, 1.4 dB, and 0.16 dB, and the 1 dB compression of -14 dBm, -12 dBm, and -9 dBm in the 2.6 GHz, 3.6 GHz, and 5.5 GHz frequency bands, respectively. The power consumption of the proposed amplifier is about 16.4 mW, 21 mW, and 12.7 mW at 1.8 V power supply in the 2.6 GHz, 3.6 GHz, and 5.5 GHz frequency bands, respectively.