Voltage controlled sine wave oscillator

Posted on Feb 6, 2014

For a 0- to 10-V input, this circuit produces sine-wave outputs of 1 Hz to 20 kHz, with better than 0. 2% linearity. Distortion is about 0. 4% and the sine-wave output frequency and amplitude settle instantaneously to a step-input change. To calibrate, apply 10 V to the input and adjust the wave-shape trim and symmetry trim for minimum distortion on

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a distortion analyzer. Next, adjust the input voltage for an output frequency of 10 Hz and trim the low-frequency distortion for minimum indication on the distortion analyzer. Finally, alternately adjust the zero and full-scale pots so that inputs of 500 V and 10 V yield respective outputs of 1 Hz and 20 kHz.

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