A reconfigurable injection-locked local oscillator (RE-ILO) generator that leverages a multitanks wideband-harmonic-shaping Class-F23 voltage-controlled oscillator (VCO), a RE injection-locked frequency multiplier (RE-ILFM), and a power-efficient injection-locked frequency amplifier (ILFA) for multiple fifth-generation (5G) millimeter-wave (mm-wave) bands is hereby presented. For the VCO, an inductive multiplier inside the positive feedback loop boosts the drain-to-gate voltage gain (Av). Besides, a source-inductive loaded on the output buffer, coupled with a separated inductor, is feedback to the drain of the cross-coupled transistors to expand the impedance peak at the 3rd harmonic for a small fluctuation of 1/ $f^{3}$ phase noise (PN) corner over the entire tuning range (TR). The measured results of the VCO prototype in 55-nm CMOS achieved the VCO measures a TR of 10.65#x2013;14.37 GHz, i.e., 29.74#x0025;. The FOM $_{T}$ is 192.2 dBc/Hz and the 1/ $f^{3}$ PN corner is 380 #x00B1; 100 kHz. Additionally, a RE-ILFM with both frequency $times 2$ doubler mode (DM) and $times 3$ tripler mode (TM) is introduced to expand the operation band of the VCO. The ILFA is cascaded for harmonic rejection and power improvement. The proposed RE-ILO generator achieves a frequency TR from 22.25 to 28.61 GHz, i.e., 25#x0025; and 35.9#x2013;42.04 GHz, i.e., 15.75#x0025; with a 1-MHz-offset PN from #x2212;102.78 to #x2212;104.1 dBc/Hz at DM, #x2212;98.48 to #x2212;100.67 dBc/Hz at TM, and consumes 66 mW power with an output power of 1.3 dBm.
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