A voltage-controlled oscillator (VCO) based on double cross-coupled multivi
brator structure with a center frequency of 4.3 GHz and a tuning range of t
GHz has been designed and implemented in standard 0.35-mum BiCMOS technolo
gy. The measured phase noise is 113 dBc/Hz at 600-kHz offset frequency from
the carrier. The VCO draws 14.6 mA from the 2.5-V supply.