A wideband variable gain differential CMOS LNA for multi-standard wireless LAN

This paper describes a wideband variable gain LNA for multi-standard wireless LAN operating in the frequency bands of 4.9-5.825 GHz, including three standards: IEEE 802.11a, ETSI HiperLAN2 and MMAC HiSWANa. By using a simple feedback loop at the second stage of LNA we realized the continuous gain control. A variable gain range of 18.7 dB (0.7 dB to 19.4 dB) is achieved. The noise figure is 1.1 dB at the maximum gain and the input 1-dB compression point is -3.5 dBm at the minimum gain, while the DC power consumption is 12.6 mW under a 1.8 V supply voltage.