American Journal of Electrical and Electronic Engineering
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American Journal of Electrical and Electronic Engineering. 2017, 5(6), 202-206
DOI: 10.12691/ajeee-5-6-2
Open AccessArticle

CMOS-Compatible Linear VCO Using a Single CFOA and Grounded Capacitors

D. K. Srivastava1, V. K. Singh2 and R. Senani3,

1Department of Electronics and Communication Engineering, SR Institute of Management and Technology, Lucknow, India

2Department of Electronics Engineering, Institute of Engineering and Technology, Sitapur Road, Aliganj, Lucknow, India

3Division of Electronics and Communication Engineering, Netaji Subhas Institute of Technology, Sector 3, Dwarka, New Delhi, India

Pub. Date: January 16, 2018

Cite this paper:
D. K. Srivastava, V. K. Singh and R. Senani. CMOS-Compatible Linear VCO Using a Single CFOA and Grounded Capacitors. American Journal of Electrical and Electronic Engineering. 2017; 5(6):202-206. doi: 10.12691/ajeee-5-6-2

Abstract

A simple CMOS-compatible linear voltage controlled oscillator (VCO) has been presented which employs a single CFOA, four MOSFETs and three grounded capacitors as preferred for IC implementation. In the proposed circuit, variable frequency oscillations are obtained by simultaneous variation of two voltage-controlled-resistors in the circuit which appear in the expression for oscillation frequency in the product form but appear as a ratio in the condition of oscillation (which therefore, remains unaffected). The workability of the proposed VCO has been confirmed by SPICE simulations using an exemplary CMOS CFOA and CMOS VCRs both implementable in 0.18µm CMOS technology.

Keywords:
sinusoidal oscillators current feedback operational amplifiers voltage controlled oscillators voltage controlled resistance

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