A wideband noise cancelling balun-LNA

In this paper a wideband noise cancelling low noise amplifier is presented. In order to achieve input impedance matching of 50 Ω, in a wide frequency band, the input stage is realized by a common-source stage with resistive feedback. To cancel out the noise of the matching input structure, the CMOS-inverter architecture is used, which achieves the high gain with low current consumption. Simulation results with Spectre RF, using TSMC 180nm show that the proposed amplifier delivers the high gain value of 26.6–31.8 dB all over the 0.1–5 GHz band of interest. Also the S11 of the LNA stays below −9.7 dB all-entire the band of interest. The proposed balun-LNA has the minimum NF value of 2.3 dB and it consumes 16.2 mW from 1.8 V voltage supply.