A 0.0058-mm<sup>2</sup> Inductor-Less CMOS Active Balun With Gain and Phase Errors Within −0.1 ± 0.2 dB and −0.18 ± 1.17<sup>°</sup> From DC to 8 GHzKeisuke Kawahara, Shinsuke Hara, Yohtaro Umeda et al.|IEEE Transactions on Circuits and Systems I Regular Papers|2023Cited by 4