A 3–5GHz frequency tunable ultra wideband LNA for OFDM applications

In this paper, a frequency tunable differential input differential output Low Noise Amplifier (LNA), used for 3–5GHz OFDM applications, is proposed and analyzed. The LNA has a wideband input matching and a tunable output matching. The digital controlled capacitor arrays in the output matching networks allow the LNA to be switched smoothly in the frequency range of 3 to 5GHz with output return loss less than −15dB. The overall LNA is designed with TSMC 0.18 µm technology, and the simulation result shows that the input return loss is less than −12dB and the noise figure is less than 4.5dB in desired frequency range. At 3.3V power supply, the LNA achieves an 8–12dB transducer gain in the frequency range with the power consumption of only 20mW.

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