MOTM

The common method for generating a sine output from a VCO involves 
taking the native waveform that the vco generates (usually a 
sawtooth), then deriving a triangle (often with a small notch at the 
peak), then using the derived triangle to drive a CA3080 into the 
nonlinear region to approximate a sine wave. The key word here 
is "approximate". It is not that pure. An oscillating VCF, however, 
can generate a very pure sine wave. When I do FM and cross linked 
chaos patches, I generally get better results when both modulator and 
modulatee are oscillating filters.

Moe


--- In motm@yahoogroups.com, "foraxx" <omgemag@h...> wrote:
> I've heard that it is difficult for a VCO to create a sine waveform
> (or really a good quality sine wave).  Is this true and why is it 
> so?  Its obvious to me that it would be harder to generate a sine 
> wave in comparison to a square wave, but what is specifically 
> challenging theoretically and in practice?