A 16.5-to-37.9 GHz Quad-Core Quad-Mode VCO With Compact 0.07 mm2 in 65-nm CMOS. - Yuan Chun Li; Ling-Yi He; Yingzhen Que; Xi-Yue Zhang; Zhu-Rui Chu; Jinchao Mou (IEEE Trans. Circuits Syst. II Express Briefs, 2025)