A 45-to-60-GHz Two-Band SiGe: C VCO for Millimeter-Wave Applications

A 45 - 60-GHz two-band double cross-coupled differential VCO is designed and fabricated using 0.25 mum SiG:C BiCMOS process technology whose f_max is greater than 200 GHz. The VCO provides tuning ranges of 44.9 - 48.9 GHz when its bias current is 13 mA and of 58 - 60.4 GHz when a bias current of 7 mA draws into the VCO. The phase noises of the VCO are measured as - 99 dBc/Hz from 48.86 GHz and - 93 dBc/Hz from 60.32 GHz, at 10 MHz offset, respectively. The VCO shows moderate FOMs of 156 dBc at 60.32 GHz and 158 dBc at 48.86 GHz.