Wiardgroup

> > There's also been a lot said about the need for through-zero 
> > operation, but we don't need to get into a big ZO discussion, do we?
> 
> I have designed and tested a through zero core. My only concern is that the extra 
> componentry will adversely affect stability. It is hard enough to get a stable analog VCO 
> with out doubling the component count of the core.
> 

The other issue with through zero FM is the oscillator core. The mathematics requires a 
unidirectional phase vector, that is a sawtooth. The only through zero core designs I have 
seen are for triangle cores. If you can point me to a through zero sawtooth core design, I 
would be interested in seeing it.