A reconfigurable 4.7–6.6GHz and 8.5–10.7GHz concurrent and dual-band oscillator in 65nm CMOS

A triple-mode 65nm CMOS VCO is designed to be reconfigurable to operate in two frequency bands, 4.7-6.6GHz and 8.5-10.7GHz, either concurrently or one at a time. Operated concurrently in the lower and higher bands, the VCO consumes 1.6mA at 1.2V and measures tuning ranges of 35%/23%, phase noise of -130/-128dBc/Hz at 10-MHz offset, corresponding to FOMs of -184/187dB, respectively. Operated in the lower and higher bands one at a time, the VCO consumes 0.75mA/1.43mA at 1.2V with tuning ranges of 34%/23% and phase noise of -131/-128dBc/Hz at 10-MHz offset, which correspond to FOMs of -186dB and -185dB, respectively.