Linear vco(8038、μA741)

Published:2011/4/14 22:46:00 Author:Ecco | Keyword: Linear , vco | From:SeekIC

The linear voltage-controlled oscillator circuit is shown as the chart. In the figure, A1 is a constant current source circuit which is used to improve charging and discharging characteristics of C1. It makes a linear relationship between the output frequency and the input control voltage. A2 is a sine wave output buffer. If inputting the low-frequency sawtooth to the control voltage terminal, the circuit will become a linear sweep generator. But putting a signal voltage on input terminal will make the circuit output frequency modulation wave. The circuit can be used as an A / D converter changing a digital signal into the voltage with a frequency counter counting the output. Linear VCO is also known as V / F converter.



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