[sdiy] square to sine
David G Dixon
dixon at mail.ubc.ca
Tue Oct 9 09:26:26 CEST 2012
I'm looking for a good way to convert square to sine. I need low-cost,
stable, low-distortion sine wave generators with excellent 1V/octave
tracking over the entire audio range.
I've read the app note for the UAF42 which suggests using a tuned state
variable bandpass filter of moderate Q, but the distortion of this is a
little high for what I want to do (about 1.5% THD). I'm hoping to get the
THD to less than 0.5%.
One method I'm thinking of is a voltage-controlled clock with divider and
switched capacitor filter. Has anybody tried this?
I'm not totally averse to digital solutions either, but I'd prefer analog.
Any ideas would be most welcome.
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