A low-power, 3-5-GHz CMOS UWB LNA using transformer matching technique

This paper presents the design of a 3-5-GHz CMOS ultra-wideband (UWB) Iow-noise amplifier (LNA) utilizing an on-chip transformer to achieve low-power operation and to realize a compact input matching network. Detailed analyses of the input match, voltage gain, and noise figure of the LNA are provided. Implemented in 0.13-mum CMOS, the LNA achieves a maximum power gain of 16.2 dB, an input return loss of greater than 11.0 dB, and a minimum noise figure of 2.8 dB for the 3-5-GHz UWB while consuming only 6.7 mW from a 1.2-V supply. The active area of the fabricated CMOS UWB LNA is 0.32 mm².