A 32 GHz quadrature LC-VCO in 0.25 /spl mu/m SiGe BiCMOS technology

A 32 GHz quadrature VCO achieves over 45 dB of image rejection in a 70 GHz-f/sub T/ SiGe process. Each VCO stage uses a new negative resistance topology to realize >330 /spl Omega/ of negative resistance with <4 fF parasitic capacitance. The coupled VCO has a measured tuning range of 30.6 to 32.6 GHz, phase noise of -97 dBc/Hz at 1 MHz offset and occupies 0.7/spl times/0.5 mm/sup 2/.