A low-power 2/5.8-GHz dual-wide-band CMOS LC-VCO with switched-inductor technique

Abstract

A fully integrated dual-band LC voltage control oscillator, designed in a 0.18-µm CMOS technology for 5.8-GHz/2.0-GHz wireless communication applications, is described. The frequency band switching is accomplished with switched-inductor technique. The dual-band oscillator can be operated in 5.38–6.23 GHz and 1.78–2.07 GHz with 15% frequency tuning range. Two different inductors are used for the frequency band switching. Frequency tuning is implemented by varying the capacitance of a MOS varactor. The measured phase noise is −109 dBc/Hz @ 1 MHz and −112 dBc/Hz @ 1 MHz for frequency at 5.8 GHz and 2 GHz, respectively. This oscillator is fabricated in UMC's 0.18-µm one-poly-six-metal 1.8 V process. The power dissipation of this dual-band VCO is 11.7 and 9.3 mW for oscillation frequency of 2 GHz and 5.8 GHz, respectively.