0.18m CMOS dual-band UWB LNA with interference rejection

Abstract

A CMOS dual-band ultra-wideband low noise amplifier (LNA) with interference rejection is presented. The proposed LNA employs a current reuse structure to reduce power consumption and an active notch filter to produce in-band rejection in the 5GHz WLAN frequency band. The load tank of the current reuse stage is optimised to provide an additional out-band attenuation in the 2.4GHz WLAN band. Measurement shows a peak gain of 19.7dB in the low band (3-5GHz) and 20.3dB in the high band (6-10GHz), while the in-band and out-band maximum rejections are 19.6 and 12.8dB, respectively. © The Institution of Engineering and Technology 2007.