An adaptive, multi-standard voltage-controlled oscillator satisfying phase-noise requirements of both 2nd and 3rd generation wireless standards is described (i.e., 1.8 GHz DCS1800, 2.2 GHz WCDMA, and 2.4 GHz WLAN, Bluetooth and DECT standards). A factor of 12 reduction in power consumption with a phase-noise tuning range of 20 dB is realized by adapting the VCO bias to the desired application. The VCO achieves -123 dBc/Hz, -110 dBc/Hz and -103 dBc/Hz phase noise at 1 MHz offset from a 2.2 GHz carrier at supply currents of 6 mA, 1.2 mA and 0.5 mA, respectively.
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