[sdiy] Low Frequency Square to Sine Waveshaper

[David Moylan]

Is the overdrive characteristic of the OTA just an extension of 
overdriving the input differential pair or is there a different 
phenomenon which makes them good for creating sines?

Dave

Paul Perry wrote:
> The problem with filtering a square wave to produce a sine, is that you get
> a different amplitude depending on the frequency you are working at.
> And it doesn't work very well anyway.
> 
> A constant amplitude triangle can be turned into a reasonable sine, either
> by a diode wave shaping circuit or by carefully overdriving an operational
> transconductance amplifier by just the right amount.
> 
> I can't think of a simple way around all this, if I wanted a number of LFO
> sines that have frequencies 1/N of a master clock, I'd be thinking about a
> number of VCOs each locked via a PPL to the master, dividing at different
> rates.
> 
> Paul Perry Melbourne australia
> 
> 
> 
> 
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