Resistive feedback LNA with dual band notch filter for suppressing WLAN signals in UWB receivers

A CMOS low noise amplifier with Out-of-band rejection for radio ultra-wide band receivers is designed and implemented in TSMC RF CMOS 0.18μm technology. Received power signal in UWB is smaller than narrow band interferences that are located near it, Thus we proposed a resistive feedback LNA that includes; input matching network, cascoded structure, RC feedback loop, LC load, output matching network and dual band notch filter with low power active inductor to improve the out-of-band rejection. Power gain of 16.03 and minimum noise figure of 2.4 dB at frequency of 3.76GHZ can be measured; maximum rejection of 20.3dB and 44.18 dB be achieved at 2.4GHz and 5.2GHZ respectively. The power dissipation of designed LNA with dual band notch filter is 15.75mW from 1.5V supply, while it was 13.5mW without notch filter.