A 11.3‐ to 19.4‐GHz Wideband CMOS LNA Employing a Triple‐Coupled Transformer for Upper‐Mid Band Applications

ABSTRACT A wideband CMOS low‐noise amplifier (LNA) for 6G upper‐mid band (7–24 GHz) applications is presented. The LNA introduces a novel interstage matching network synthesized from first principles as a fourth‐order bandpass filter to achieve a broad, flat gain response. This filter is realized using a compact triple‐coupled transformer (TCT), which simultaneously provides intrinsic gm‐boosting through a negative feedback path without additional power consumption. The TCT's architecture is systematically designed to create a dual‐resonant characteristic, effectively extending the bandwidth while maintaining high gain. Fabricated in 65‐nm CMOS, the LNA occupies a core area of 0.21 mm 2 . Measurement results show a 3‐dB bandwidth from 11.3 to 19.4 GHz, a peak gain of 10.5 dB, and a noise figure of 1.8–3.8 dB, while consuming only 7.9 mW from a 1‐V supply.