An ultra-low power, fully integrated VCO for an implantable wireless sensor microsystem in 90-nm CMOS

摘要

A fully-integrated, low-power 1830 MHz voltage-controlled oscillator (VCO) used in the frequency synthesizer of an implantable wireless multisensor microsystem (IWSM) dedicated to in vivo monitoring of biological parameters is presented. The VCO, implemented in a 90-nm CMOS process, draws 380 μA from a 1-V supply. Post-layout simulations show that the amplitude of oscillations is 450 mV, the phasenoise is −120 dBc/Hz at 1 MHz offset from the carrier and the frequency tuning range is over 150 MHz.