A low-power high-gain 2.45-GHz CMOS dual-stage LNA with linearity enhancement

This paper presents a dual-stage LNA design which is enhanced for gain, linearity and noise figure under a certain power constraint. The LNA benefits from an inductively-degenerated cascode amplifier in the first stage which is followed by a common-source amplifier as the second stage. Two techniques are used to improve the linearity of this 24-dB gain LNA while maintaining the noise figure equal to 2 dB. An input 1-dB gain compression point of -21 dBm was achieved at 2.45-GHz operating frequency. The 0.13-μm CMOS LNA draws a 4-mA current from a 1.2-volt power supply.