Re(1): V/Oct >> Hz/V converter circuit?

[Scott Gravenhorst]

"jhaible" <jhaible at debitel.net> wrote:
>
>> I believe that all analogue VCO designs have at their heart, a
>> linear (v/hz) VCO.  V/oct VCOs have what is called an exponential
>> converter or expo converter that translates the incoming v/oct
>> control voltage to linear (v/hz) which then controls the oscillator.
>
>No. It's a widespread misconception.
>The core of almost every VCO is a CCO (current controlled oscillator),
>which is inherently linear ("amperes / Hz").
>A V/Oct VCO has an exponential voltage -> current converter in front of
>this core.
>A V/Hz VCO has a linear voltage -> current converter in front of this core.
>
>More details in reply to Magnus (next mail).
>JH.

Ah yes, I forgot about the v/i converter in front of the actual oscillator.
Thanks for clearing that up.  But the fact remains that CCOs and VCOs are 
(as you say) "inherently linear" without the expo converter.


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