A 7.2-29.8 GHz LNA With 1.35-2.67-dB NF Using Coupled-Line-Based Transformers in 0.15- μm GaN-on-SiC Technology. - Cheng-Jie Hu; Hui-Yang Li; Jin-Xu Xu; Li Gao; Xiuyin Zhang (IEEE Trans. Circuits Syst. I Regul. Pap., 2025)