A Fully Integrated Dual-Frequency Push-Push VCO for Wideband Wireless Applications

A fully integrated VCO with dual frequencies at 3.5 and 7 GHz for mixers and PLL are described. The circuit has 1.2 GHz tuning range at 7 GHz and 25 dBc 3.5-GHz signal leakage to 7-GHz port. This work avoids the using of frequency dividers, hence the chip sizes, power consumption and cost are reduced. Good agreement between simulation and measurement was obtained.