An Improved Triangular/Square-Wave VCO Using OTAs
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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/°C temperature coefficient of frequency over -20°C to 40°C.
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/°C temperature coefficient of frequency over -20°C to 40°C.
참고문헌 (3)
- J. W. Haslett, "Current-switching linear VCO", Electron. Lett, 25, pp.139~140 (1989)
- W.-S. Chung, "Temperature-stable VCO based on operational transconductance amplifiers", Electron. lett, 26, pp.1900~1901 (1990)
- "National Operational Amplifiers Databook", pp.631~648 (1995), National Semiconductor Corp