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A single-ended ultra wideband (UWB) low noise amplifier (LNA) employing an improved noise reduction (INR) technique is presented. The INR consists of three main components encompassing active positive feedback, input matching extender and transformer. The input matching extender helps to preserve the input return loss (S11) less than -10 dB over entire bandwidth from 2 to 7.6 GHz. Using active positive feedback and transformer reduces the noise figure (NF) significantly. Moreover, compare to the version with no transformer and with the same gain, with the aim of transformer power consumption is reduced to about half. Simulated in a 0.13-μm RF CMOS technology, the proposed LNA achieves a power gain of 13.8 dB with only 0.7 dB variation and the NF is between 1.85-2.1 dB over whole bandwidth while consumes only 2.15 mW dc power from a 1.1 V supply voltage.
Date of Conference: 15-18 May 2011