Innovative techniques for achieving flat response in a dual-resonance ultra-wideband low-noise amplifier

This paper introduces a two-stage ultra-wideband low-noise amplifier (UWB-LNA) intended to be used in wireless communication systems. The architecture uses a novel double-resonance load network in the first stage and resistive shunt feedback in the second stage to achieve wide bandwidth with a flat response. A common gate stage at the input port seeks to present a high-impedance load to the single resonant network, while concurrently shunt negative feedback, source degeneration, and cascoded feedback schemes are used to improve performance. In this respect, the cascoded feedback provides flat gain across a wide bandwidth, while the source degeneration helps in impedance matching. Post-layout foot-print for the UWB-LNA designed and simulated using Cadence Virtuoso 180nm technology is 0.532 mm(2) with an operating frequency 3.1-10.6 GHz incorporated. Operating on a 1.8 V supply voltage, it consumes 6 mW of power. The amplifier achieves a maximum gain of 18.75 dB, maintaining a flat low noise figure of 3.15 dB across frequencies ranging from 3.1 to 10.6 GHz. Stability analysis using the Roulettes test confirms the reliability of the proposed LNA, with K-f > 1 and Delta < 1.