A 3.1-5GHz high and flat gain UWB LNA

A 3.1-5 GHz Ultra Wideband (UWB) CMOS low noise amplifier (LNA) with high gain and noise cancellation is presented. The LNA is composed of two stages-an input common-gate stage with a resonant load at 3.1 GHz, driving a common source stage with a resonant load of 5 GHz. Noise cancellation is achieved through the forward feedback technique, and an output buffer has been added for test purposes. The amplifier has been designed in a 0.65 nm CMOS process, and has a power gain of 21 dB that varies less than ±0.5 dB across the 3.1-5 GHz band with a noise figure of less than 5.4 dB. The LNA consumes 8 mA of current from 1 V power supply and occupies 0.24 mm² of chip area.