A Wide Tuning Range and Low Phase Noise VCO using New Capacitor Bank Structure

  • Mostafa Katebi University of Zanjan
  • Abbas Nasri University of Zanjan
  • Siroos Toofan University of Zanjan
Keywords: Voltage Controlled Oscillator, VCO, Capacitor bank, Low noise, wide tuning.


This paper presents a wide tuning range, and low noise voltage controlled oscillator (VCO) based on cross-coupled and colpitts structures. The advantages of this work provide a low-phase noise and robust start-up condition, leading to minimized the dc power. In addition, a new structure of capacitor bank is used in this structure to achieve a wide range of frequency. The proposed circuit is simulated in 0.18 µm CMOS process. The designed VCO covers the frequency range of 21.95 GHz to 24 GHz with a tuning range of 8.9%. Simulation results show that the phase noise is -120.5 dBc/Hz at 1MHz offset frequency for 23GHz carrier frequency.  Also, power consume of the VCO is 6.34 mW under 1.8 supply voltage, and the figure-of-merit is -191.68 dBc/Hz.


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How to Cite
Katebi, M., Nasri, A., & Toofan, S. (2018). A Wide Tuning Range and Low Phase Noise VCO using New Capacitor Bank Structure. Majlesi Journal of Electrical Engineering, 12(4), 95-103. Retrieved from http://mjee.iaumajlesi.ac.ir/index/index.php/ee/article/view/2471