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Why don't I get a Sine wave?

Audioguru

Sep 24, 2016
3,650
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Sep 24, 2016
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3,650
My very low distortion sinewave generator project uses a variable frequency squarewave oscillator clocking a CD4018 with 5 resistors on its outputs making a mixed waveform with 10 steps (shown in Don Lancaster's Cmos Cookbook). Then two switched capacitor Butterworth lowpass filter ICs in series remove all the harmonics. The clock for the filters is the same clock for the CD4018. Some people simply filter the squarewave and end up with fairly low distortion.
 
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