CMOS oscillator with MOS varactor and body bias tuning
by Manoj Kumar
International Journal of Circuits and Architecture Design (IJCAD), Vol. 2, No. 1, 2016

Abstract: In this paper, designs of voltage controlled oscillator (VCO) using three transistors XNOR gates with variable capacitive load have been presented. Three and five stage VCO circuits have been designed using the concept of reverse body bias and variable NMOS load. The tuning of output frequency has been controlled by coarse and fine tuning methods. Coarse tuning has been achieved with the variation in supply voltage from 1.8 V to 3 V and fine tuning has been obtained with variation in reverse bias voltage of NMOS load from 0 V to −0.8 V. A tuning range of 20% and 19% have been obtained with the proposed three and five stages VCO circuits. Results have been obtained for 0.18 µm CMOS technology. Power consumption and output frequency range of proposed VCO circuits have been compared with earlier reported circuits and proposed circuit's shows improved performance.

Online publication date: Tue, 12-Apr-2016

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