A band-reject ir-UWB LNA with 20 dB WLAN suppression in 0.13 μm CMOS

Custom designed for the IEEE802.15.4a standard, a 2-stage pseudo-differential low-noise amplifier (LNA) with a notch ges 20 dB in the IEEE802.11a WLAN band is presented for impulse-radio ultra-wideband (ir-UWB). This band-reject LNA is power-to-current (PI) configured employing reactive dual-loop negative feedback, which reduces the noise figure and allows for orthogonal impedance and noise matching over the prescribed bandwidth (i.e., 3.25-10.25 GHz). The LNA is fabricated in 0.13 mum CMOS and presents a maximum power gain of 17 dB, a -9 dBm IIP3 and a 2.5 dB noise figure at 6 GHz, when matched to 50 Omega (single-ended). Noise figure variation across the pass-band(s) is limited to les 0.75 dB. Employing a current-reuse technique limits the total power consumption to les 15 mW from a 1.2 V supply. The LNA occupies a die area of 1.4 times 1.2 mm².