A Low Voltage Full-band Folded Cascoded UWB LNA with Feedback Topology

In this paper, a low voltage ultra wide band (UWB) low noise amplifier (LNA) is designed in a standard 0.18μm CMOS technology. In order to possibly minimize the amount of supply voltage, the forward body bias technique is combined with the folded cascode structure and for extending and flatting the band width, the feedback topology is used. With an optimized configuration combining advantages of feedback topology and forward body bias, folded cascode topology, the adjustable wide input matching is got and noise figure (NF) is controlled to a relevant low status. This novel structure achieves peak gain of 12dB and noise figure varying from 4.6-2dB within the band of 3-15GHz. The LNA uses supply of 0.8V while consuming only 12.5mW of dc power. To the best of our knowledge, this structure for low voltage UWB LNA has not been reported previously.