Abhishek Kumar

Work place: Lovely Professional University, Punjab, India

E-mail: abhishek.15393@lpu.co.in


Research Interests: Computational Engineering


Abhishek Kumar pursuing PhD in Electronics and Electrical Engineering from Lovely Professional University, Punjab, India His area of interest is secured hardware design for random number and secret key, additional silicon IC based feature included in cryptographic module. He is focused on CMOS circuit design for low power, data converter, memory unit and computational circuit at CMOS 90nm technology.

Author Articles
Wide Tuning Range CMOS VCO

By Abhishek Kumar Kriti Tiwari

DOI: https://doi.org/10.5815/ijem.2017.05.03, Pub. Date: 8 Sep. 2017

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.

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