Abstract
This letter presents a low phase noise BiCMOS dual-band voltage-controlled oscillator (VCO). The designed circuit consists of a dual-resonance LC resonator and a Colpitts negative resistance cell. The dual-resonance LC resonator comprises a series-tuned LC resonator and a parallel resonant resonator. The proposed VCO has been implemented with the TSMC 0.18 μm SiGe 3P6M BiCMOS process. The VCO can generate differential signals in the frequency range of 3.91~4.17 GHz and 7.24~7.80GHz with core power consumption is 6.30mW and 5.88mW at the dc bias of 1.4 V respectively. At 4.0 GHz and 7.74 GHz, phase noise at 1MHz offset is -121.13dBc/Hz and -115.87dBc/GHz respectively. The die area of the dual-band VCO is 0.485×0.800 mm2.
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