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

[jhaible]

> 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.