AW: VC pots

Haible_Juergen#Tel2743 HJ2743 at
Fri Oct 27 18:12:00 CET 1995

>   I don't know the exact definition for "OTA", but I think some
>   VCA circuits use a modified 4-quadrant-multiplier structure and
>   have the audio signal modulating the *current sources* of
>   the two long tailed pairs, routing the *control voltage*
>   to the bases of the pairs.
>Ah yes, of course!  This arrangement does deserve a seperate catagory
>because the circuit configuaration has sufficiently different

Do You know something about the drawbacks of this architecture?
I heard that with these VCAs distortion would increase with decreasing
control voltage, but I haven't dug deeper into that. Any ideas?


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