Design of voltage-controlled oscillator in GSM/EDGE handset RFIC

Based on the requirements of phase noise and frequency tuning range of the GSM system, this paper designs a voltage-controlled oscillator suitable for GSM/EDGE handset RFIC with the structure of no-tail current source and switched-capacitor array. The whole circuit uses TSMC 0.18µm CMOS technology. The power supply is 3.3V. The simulation results show that the operating frequency covers 3296∼3980MHz, the peak value of output voltage is 5.32V@3622MHz, and the phase noise is −101.41dBc/Hz at 100 kHz offset and −155.37dBc/Hz at 20MHz offset. It will satisfy the requirements of GSM/EDGE application.