Wideband common-source low-noise amplifiers (LNAs) operating at 28 GHz typically use passive (and inevitably lossy) matching networks to realize the desired input power match. This paper proposes the use of the intrinsic feedback for input impedance matching to avoid most of the passive components at the LNA input. The wideband input matching characteristic is achieved mainly via the feedback through gate-drain capacitance to realize a shunt R-C input impedance and also via a small series gate inductor to resonate out some of the input capacitance. Back-gate biasing is used to further reduce the noise figure. This concept is validated with a 22-nm FDSOI LNA. This LNA demonstrates the input power-match bandwidth from 7.7 to 33.3 GHz, achieves 14.7 dB of gain, –11.2 dBm of IP1dB, and the noise-figure minimum of 1.83 dB while consuming 10 mW DC power in its core stages and additional 2.4 mW in the output unity-gain buffer.