2007•Research & Progress of SSE Solid State ElectronicsRequires access
A 4.2 GHz 1.8 V CMOS LC VCO
Tianchun Ye
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Abstract
According to the Hajimiri VCO phase noise model, the effects of LC VCO circuit parameters on phase noise are analyzed. Several emphases about LC VCO design, including high Q on-chip inductor design, MOS-varactor design and tail current choice, are presented. A 4.2 GHz 1.8 V LC VCO is fabricated with SMIC 0.18 μm Mixed Signal 1P6 M CMOS process. The measured results show that phase noise is —101 dBc/Hz at a 1 MHz offset from the carrier frequency 4.239 GHz, and the VCO tuning range is 240 MHz.