A Dual Band Concurrent Low Noise Amplifier for Bluetooth and WLAN Applications

A fully integrated concurrent dual-band low noise amplifier (LNA) is introduced and simulated in 0.18μm CMOS technology. The LNA is able to simultaneous operate at two different frequency bands (2.4GHz and 5.8GHz) which may use in Bluetooth and WLAN applications. The architecture uses a concurrent cascode LNA with capacitive positive feedback for improving the power gain and provides simultaneous narrow band matching at the both frequencies. The LNA provides very good power gain and matching at both frequencies. Measured results show input return losses of -15.8dB and -16.17dB, output matching of -32.5dB and -13.47dB, power gain is about 19.55dB and 15.5dB and its noise figure is about 1.12dB and 1.7dB at 2.4GHz and 5.8GHz respectively. The circuit delivers 4.09mA of current from 1.8V power supply

Keywords:

LNA , Noise Figure , Input Matching , Output Matching