A 0.35 μm SiGe Low-Noise Amplifier for UWB, Receivers with Integrated Interferer Rejection

A fully integrated solution for rejecting the interference caused by wireless local area network (WLAN) transmissions in the 4.9-5.825 GHz band for ultrawideband (UWB) receivers is presented. Front-end prototypes implemented in a low cost 0.35 μm SiGe BiCMOS technology are used as a test vehicle to assess the effectiveness of the presented approach. The proposed blocker altering technique mitigates the gain desensitization, third-order intermodulation distortion and second-order intermodulation distortion by as much as 9.8 dB, 7.9 dB and 6 dB, respectively. At a power consumption of only 49.2 mW, the maximum receiver conversion gain and the minimum double side-band NF measured at the PCB connectors are about 22 dB and 5.5 dB, respectively, with an input match of -10 dB over the 3.1-8 GHz band.