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A New Temperature Compensation Method for a 2.5 GHz Integrated VCO


Abdennaceur Kachouri, Dalenda Ben Issa, Nabil Boughanmi, Mounir SAMET


Vol. 7  No. 5  pp. 78-85


A 2.5 GHz fully integrated voltage controlled oscillator (VCO) for wireless application has been designed in a 0.35?m CMOS technology. A method for compensating the effect of temperature on the carrier oscillation frequency has been presented in this work. We compare also different VCOs topologies in order to select one with low phase noise, low supply sensitivity and large tuning frequency. Good results are obtained with a simple NMOS ?Gm VCO. This proposed VCO has a wide operating range from 300 MHz with a good linearity between the output frequency and the control input voltage, with a temperature coefficient of -5 ppm/°C from -20°C to 120°C range. The phase noise is about -135.2dBc/Hz at 1MHz from the carrier with a power consumption of 5mW.


Radiofrequency, VCO, CMOS process, compensated temperature, phase noise