[sdiy] Why do we need the buffers? - gm-C filter question

[René Schmitz]

Hi Jürgen, Aaron and all,

JH. wrote:
> * Some of the "later" synthesizer chips did this.
> 
> * I tried it in simulation, and found much less attenuation of high
> frequencies
>    in the range way beyond the cuttof frequency in LP filters.
>    I think it's pararasitic Cs, and in the resistor dividers prevent HF
> coupling
>    thru all stages.
>
> * Maybe (maybe!) that's one reason why "first generation" SSM and CEM
>    sound better than later ones.

But would wonder if this really had been the concern of the makers of 
the first generation chips (and discrete circuitry)?

Cheers,
  René

-- 
uzs159 at uni-bonn.de
http://www.uni-bonn.de/~uzs159