[sdiy] VCO Tuning goals

[Aaron Lanterman]

The EML state varible filter uses and interesting "differential  
integrator" that has two capacitors. It's not "switched," but it may  
provide inspiration.

Sent from my iPhone

On Oct 6, 2009, at 8:15 PM, "David G. Dixon"  
<dixon at interchange.ubc.ca> wrote:

>> Can't you get around the cap discharge time by using two capacitors
>> and switching between them? One is getting discharged while the other
>> one is loading?
>
> I presume you're talking about a triangle-core VCO?  That's a very
> interesting idea.  However, it would require a very (VERY) careful  
> trim of
> the resistors feeding each cap to ensure triangle symmetry, and also  
> two
> very well matched JFETs (matched for on-resistance).  Still,  
> interesting
> idea (the "push-me-pull-you VCO"!)
>
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