A fully-integrated BiCMOS voltage-controlled oscillator for DECT application

A voltage-controlled oscillator (VCO) with an integrated inductor and varactor diodes achieves -139 dBc/Hz phase noise at 6.4 MHz frequency offset in the 1880-1900 MHz DECT band. The VCO has 250 MHz tuning range and 125 MHz/V gain which is enough to compensate production tolerances. The monolithic circuit is fabricated in a 0.5 /spl mu/m 25 GHz f/sub T/ BiCMOS process.