Wide Tuning Range CMOS VCO

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Abhishek Kumar 1,* Kriti Tiwari 1

1. Lovely Professional University, Punjab, India

* Corresponding author.

DOI: https://doi.org/10.5815/ijem.2017.05.03

Received: 14 Jan. 2017 / Revised: 30 Jan. 2017 / Accepted: 13 May 2017 / Published: 8 Sep. 2017

Index Terms

Ring oscillators, Voltage-controlled oscillators, Frequency, Phase noise, Tuning, Bandwidth


A communication system requires a highly stabilized frequency; LC and RC oscillator are two wide option for frequency generation. Performance of an LC oscillator suffers from leakage, area, noise etc compare RC oscillator. Voltage controlled oscillator (VCO) is preferred category if RC oscillator to generate high oscillator frequency. VCO contains odd number of delay stage cascaded together; output frequency strongly depends on switching threshold of individual stages. A 3 stage current starved VCO can generate upto 0.6 Ghz; this work is focused around body bias technique to increase frequency without increasing number of delay stage. Oscillation frequency has been controlled by bulk terminal of PMOS and NMOS individually and by means of adaptive body bias network. Cadence spectre based simulation result at CMOS 90nm shows that by reverse biasing of PMOS obtained frequency is 1.2GHz-10.01GHz with tuning range of 95% while biasing of NMOS generate frequency of 500MHz- 12.5GHz with tuning range capability of 96%. This design presents high frequency with wider tuning range and optimum reduced power by which this oscillator design can be used in different band of communication.

Cite This Paper

Abhishek Kumar, Kriti Tiwari,"Wide Tuning Range CMOS VCO", International Journal of Engineering and Manufacturing(IJEM), Vol.7, No.5, pp.31-38, 2017.DOI: 10.5815/ijem.2017.05.03


[1]Behazd Razavi, "Design of analog cmos integrated ciruit", July 2000.

[2]Eitenne sicard, Sonia Delmas “Advanced CMOS cell Design“ Tata McGraw Hill Professional, 2007

[3]P. M. Farahabadi, H. Miar-Naimi, A. Ebrahimzadeh, "A New Solution to Analysis of CMOS Ring Oscillators", Iranian Journal of Electrical & Electronic Engineering, vol. 5, no. 1, March 2009.

[4]J.K.Panigrahi, D.P.Acharya, “Performance Analysis and Design of Wideband CMOS Voltage Controlled Ring Oscillator”, IEEE 5th International Conference on Industrial and Information Systems Proceedings, pp 234-238, Jul29-Aug 01, 2010.

[5]M K Mandal, B C Sarkar,” Ring oscillators: Characteristics and applications” Indian Journal of pure and applied physics Vol.48,pp136-145,2010.

[6]M K Mandal, B C Sarkar, "Ring oscillator: Characteristics and application", Indian journal of pure & applied physics, vol. 48, pp. 136-145, February 2010.

[7]Ashish Raman and R.K sarin “1P6M 0.18-μn Low Power CMOS Ring Oscillator For Radio Frequency Application “International journal of computer Theory and Engineering ,Vol 3,No.6 pp770-774,2011.

[8]Sushil Kumar, Gurjt Kumar, "Design and performance of nine stage cmos based ring oscillator", International Journal of VLSI design & Communication Systems (VLSICS), vol. 3, no. 3, June 2012

[9]Sushil Kumar and Dr. Gurjit Kaur, “Design and performance analysis of nine stages CMOS based ring oscillator,” International Journal Of VLSI Design & Communication Systems Vol.3, No.3, 2012.

[10]X. Gui, M. M. Green, "Design of CML Ring Oscillators With Low Supply Sensitivity", IEEE Transactions on Circuits and Systems I: Regular Papers, vol. 60, no. 7, pp. 1753-1763, July 2013.

[11]Abhishek Kumar. “Effect of Body Biasing Over CMOS Inverter” International Journal of electronics & communication technology, Vol 4, issue 1, pp 369-371, Jan-march 2013.

[12]Vandna Sikarwar, Neha Yadav, Shyam Akashe,” Design and analysis of CMOS ring oscillator using 45 nm technology” IEEE 3rd International conference on Advance computing, pp1491-1495, 2013

[13]Akansha SHRIVASTAVA, Anshul SAXENA, Shyam AKASHE “High performance of low voltage controlled ring oscillator with reverse body biasing” Frontier of optoelectronics,Vol.6,Issue3 pp-338-345, 2013

[14]Abbas Ramazani, Sadegh Biabani, Gholamreza Hadidi, "CMOS ring oscillator with combined delay stages", International ournal ofelectronics and Communication. (AEU), vol. 68, pp. 515-519, 2014.

[15]Kriti Tiwari, Abhishek Kumar. “11 GHz CMOS Ring oscillator” International Conference on Computing, Communication, and Automation”, pp 1280-1283, 2015