Journal of IKEEE (전기전자학회논문지)

Institute of Korean Electrical and Electronics Engineers (한국전기전자학회)
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An Improved Triangular/Square-Wave VCO Using OTAs

  • Jeong, Jin-Woong (School of Electronics and information Engineering, Cheongju University) ;
  • Won, Chang-Su (School of Electronics and information Engineering, Cheongju University) ;
  • Chung, Won-Sup (School of Electronics and information Engineering, Cheongju University)
  • Published : 2008.09.30
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Abstract

An improved triangular/square-wave VCO using OTAs is presented. It consists of two OTAs, a timing capacitor, and a resistor. A prototype circuit built with commercially available components exhibits less than 0.01% nonlinearity in its current-to-frequency transfer characteristic from 0.2 to 14 kHz and 450 ppm/$^{\circ}C$ temperature coefficient of frequency over $-20^{\circ}C$ to $40^{\circ}$.

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