A CMOS CURRENT CONTROLLED RING OSCILLATOR WITH WIDE AND LINEAR TUNING RANGE

Authors

  • Ekachai Leelarasmee Department of Electrical Engineering, Faculty of Engineering, Chulalongkorn University

DOI:

https://doi.org/10.11113/aej.v1.15286

Abstract

A new CMOS current controlled ring oscillator is investigated. It is based on a 3 stage ring oscillator. Each stage uses a simple NMOS for switching a current source to charge a capacitor and discharging it thereby generating a ramp output. Its oscillation frequency depends on the current source. This simple circuit can have a wide tuning range but has some non-linearity problem. A modification of the original circuit using inverters can significantly improve the linearity without consuming a lot of additional current and layout. Simulation result using 1pF indicates that the oscillator has 476KHz/uA frequency sensitivity and can be tuned from 476Hz at 1nA to 476KHz at 1000nA with good linearity.

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Published

2011-06-22

Issue

Section

Electrical and Electronic Engineering

How to Cite

A CMOS CURRENT CONTROLLED RING OSCILLATOR WITH WIDE AND LINEAR TUNING RANGE. (2011). ASEAN Engineering Journal, 1(2), 5-10. https://doi.org/10.11113/aej.v1.15286