A Multiband, Low Power and Low Phase Noise CMOS Voltage-Controlled Oscillator with NMOS Varactor for UWB Applications

Hanen Saoudi, Hamadi Ghariani, Mongi Lahiani


A multiband low power and low phase noise LC-tank Voltage Controlled Oscillator (VCO) is designed for low band channels of the standard IEEE 802.15.4a. The LC-VCO uses the structure of complementary cross-coupled differential negative resistance and tank circuit, which contains varactor arrays for frequency fine-tuning and a spiral inductor. A method that uses resistor tail biasing for reducing the phase noise and the power consumption has been adopted. The circuit is fully designed in TSMC’s 180 nm technology process. The oscillator output provides three center frequencies of 3.5, 4, 4.5 GHz with good phase noises of -113.784, -116.703 and -126.753 dBc/MHZ at 1 MHz offset, while it dissipates 9mW power energy. The proposed LC VCO not only set a good balance between low phase noise and low power consumption, but it is also a highly desired circuit for multiband wireless transceiver systems, which are the major contributions of this proposed design.


LC VCO; Phase Noise; Multiband; Varactor; Low Power

Full Text:



L. A. N. Man, S. Committee, “ Part 15 . 4 : Wireless Medium Access Control ( MAC ) and Physical Layer ( PHY ) Specifications for Low-Rate Wireless Personal Area Networks ( WPANs ), ” IEEE Computer Society, vol. 2006, no. September. 2006, pp.2-305.

F. C. Commission, “Revision of Part 15 of the Commission’s Rules Regarding Ultra-Wideband Transmission Systems,” First Rep. Order …, no. FCC02-48, pp. 1–118, 2002.

J. Kim, J. Park, and J. Kim, “A low phase noise multi-band LC VCO using a switched di ff erential inductor,” IEICE Electronics Express ,vol. 15, no. 7, pp. 1–7, 2018.

X. Lei, J. Zhang, and J. Shi, “Analysis and Design of a Wideband Low Phase Noise LC VCO,” PIERS Proceedings, vol. 2, no. 2, pp. 968–972, 2015.

N. C. Shirazi and R. Hamzehyan, “Design of VCO with a Differential Tunable Active Inductor,”Int. J.of Machine learning and computer, vol. 3, no. 1, pp. 3–6, 2013.

B. Jafari and S. Sheikhaei, “Pseudo-impulse tail current shaping for phase noise reduction in CMOS LC oscillators,” Microelectronics J., vol. 74, no. December 2017, pp. 60–68, 2018.

A. Hajimiri and T. H. Lee, “Design Issues in CMOS Differential LC Oscillators,” IEEE J. of solid state circuit, vol. 34, no. 5, pp. 717–724, 1999.

B. Jafari and S. Sheikhaei, “Phase noise reduction in a CMOS LC cross coupled oscillator using a novel tail current noise second harmonic fi ltering technique,” Microelectronics J., vol. 65, no. May, pp. 21–30, 2017.

I. F. I. Albittar, H. Dogan, and M. T. Ozgun, “A novel biasing technique for low phase noise voltage controlled oscillators,” Microelectronics J., vol. 72, no. May 2017, pp. 120–125, 2018.

N. Oh, “A phase-noise reduction technique for RF CMOS voltage-controlled oscillator with a series LC resonator,” Microelectronics J., vol. 45, pp. 435–440, 2014.

S. D. Resistors, “RF CMOS LC -Oscillator With Source Damping Resistors,” IEEE Microwave and Wirelles Components letters, vol. 16, no. 9, pp. 511–513, 2006.

Y.J. Moon, Y.S. Roh, C.Y. J, and C. Y, “A 4.39–5.26 GHz LC-Tank CMOS Voltage-Controlled Oscillator With Small VCO-Gain Variation,” IEEE Microwave and Wireless Components Letters, vol. 19, no. 8, pp. 524–526, 2009.

A. Nasri and M. Yargholi, “Design of a LC-Tank CMOS Voltage-Controlled Oscillator,” Int. J.of Research in Electrical and Electronics technology, vol. 1, no. 2, pp. 33–37, 2014.

A. L. Phase and N. Lc-vco, “A 4GHz Low Phase Noise LC-VCO in 0.18µm CMOS Technology,” Int. Conf on Power Electronics, Systems and Applications, pp. 18–21, 2012.

V. Narayana and R. Vanukuru, “A High Performance Switchable Multiband Inductor Structure for LC-VCOs,” Int. Conf on VLSI Design, pp. 253–258, 2017.

H. Saoudi, M. Dhieb, H. Ghariani, and M. Lahiani, “Design of 10.6 GHZ low phase noise LC-Voltage controlled oscillator in 0.18 ȝ m CMOS Technology,” Int.Conf On Sciences and Techniques of Automatic control &Computer engineering, pp. 1–7, 2017.


  • There are currently no refbacks.

Creative Commons License
This work is licensed under a Creative Commons Attribution 3.0 License.

ISSN: 2180-1843

eISSN: 2289-8131