A 116-132GHz -193.6dBc/Hz-FoMT -252.8dB-FoMJ Frequency Synthesizer Using a 114fs-Jitter 60-GHz Double-Sampling PLL with Magnetic Parabolic Tuning and Injection-Locked Frequency Doubler

A wide-tuning-range (TR) low-phase-noise (PN) D-band frequency synthesizer cascades a mm-Wave double-sampling PLL (DSPLL) with a D-band differential-output injection-locked frequency doubler (ILFMx2). DSPLL consists of a dual-band VCO (DBVCO) with magnetic parabolic tuning and split primary coils, an injection-locked frequency divider (ILFD), and a superior double-sampling phase detector (DSPD) enabling a dual-path loop filter. ILFMx2 features differential outputs, self-oscillation current boosting, and center-tap injection. Fabricated in a 28-nm CMOS, the synthesizer measures TR of 12.9% from 116 to 132G, PN@1M normalized to 120G of -92.9~-106.1dBc/Hz, jitter (1k-100M) of 35.1-145.3fs, FoMT@1M of -180.6~-193.6dBc/Hz, and FoMJ of -240.3~-252.8dB.