A triple path noise cancellation LNA with transformer output using 45 nm CMOS technology

Dheeraj Kalra – Vishal Goyal – Mayank Srivastava

   A triple path dual resistive feedback noise cancellation (TP-DRNC) low noise amplifier (LNA) with transformer output presented which provides high gain, low noise figure (NF), and high figure of merit F_M. The analysis of triple path, dual resistive, gain, and NF have been discussed. The effect of various components used in the circuit have been analyzed and their optimized values are obtained which resulted in the high F_M. The combination of dual resistive feedback with triple path NC transformer output allowed for low NF and high gain. The proposed GPDK 45 nm complementary metal oxide semiconductor (CMOS) technology-based LNA offers a flat gain curve of 10.81 dB over the range of 1.6 GHz to 4.3 GHz, or 2.7 GHz bandwidth, and S₁₁ less than -9 dB. The input third order intercept point (IIP3) for the given bandwidth has value of 5.7 dBm, while the minimal NF achieved is 2.7 dB; F_M1 is 14.026 and F_M2 is 12.48. The proposed LNA's layout with an off-chip transformer has an area of 0.01985 mm².

Keywords: LNA, noise cancellation, common gate-common source, resistive feedback, IIP3, noise factor (NF)

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