A CMOS fully integrated 1 GHz and 2 GHz dual band VCO with a voltage controlled inductor

A fully integrated voltage controlled oscillator with a wide tuning range from 978 MHz to 2010 MHz is presented. The LC-VCO was designed in INFINEON low-cost 0.25 µm 4 metal standard CMOS process, using an integrated fully symmetrical coil. The frequency of the presented LC-VCO is both capacitance- and inductance-controlled. A novel voltage controlled fully differential inductor is introduced. Testchip results using the inductance tuning to implement a dual band VCO are presented. At 1GHz the VCO consumes 7.5 mA from a 1.5 V supply voltage and features a measured phasenoise of -138 dBc/Hz at 3 MHz offer. At 2 GHz 9 mA from a 1.5 V supply is consumed and the VCO features a measured phasenoise of -132 dBc/Hz at 3 MHz offer.