A very low phase-noise voltage-controlled-oscillator at X-band

Summary form only given, as follows. An X-band VCO is designed using a compact tunable high-Q negative-R resonator. The proposed resonator is a reactively-terminated active band-pass filter, which provides high frequency-selectivity and, at the same time, initiates and sustains the oscillation. This approach results in a simple and compact VCO structure. The fabricated VCO operates at 8.2 GHz with 105 MHz tuning range and a measured phase-noise of −149.5 dBc/Hz at 1 MHz. The VCO achieves record values for phase-noise and FOM.