A Low Power and Linear Voltage Controlled Oscillator Using Hybrid CMOS-CNFET Technology

This paper presents a hybrid CMOS-CNFET voltage controlled oscillator (VCO) with low power dissipation and linear response over a wide control voltage range. The hybrid circuit is based on PTM 32nm low power CMOS devices and 32nm CNFET devices with different threshold voltages. The VCO frequency and power dissipation are investigated for CNFET parameters such as number of nano-tubes, gate oxide thickness, inter CNT pitch and chiral vectors. The linearization of VCO response is achieved using a hybrid CMOS-CNFET device combination without needing a resistor or a wide device. The circuit exhibits excellent linearity as compared to pure CMOS circuit over a tuning range from 84MHz to 1.6GHz corresponding to a control voltage range from 0.3V to 0.8V. The VCO power dissipation is confined within sub 15μW range for control voltages up to 0.6V.