SV: Re: [sdiy] CEM3328 seems to only have buffers at the end

[karl dalen]

That picture dosent tell me anything!

Here is something for you to do.
Draw up the ladder stage in the simu machine, 
add some bias and "unbalance the ladder"
what do you get.

Antti, what is it you are trying to prove?
I dont understand the discussion?

The title says: "CEM3328 seems to only have buffers at the end".
Im looking in one of the schemos now and i defenetively  se a
buffer inbetween stages, "IF" and only IF a single trannie
and its base conected to previous charge cap can be said 
to be a buffer! I call that a buffer.

What is the defenition of buffers anywhay?

KD

--- Antti Huovilainen <ajhuovil at cc.hut.fi> skrev:

> On Tue, 21 Feb 2006, Antti Huovilainen wrote:
> 
> > On Tue, 21 Feb 2006, JH. wrote:
> >
> >>> However, the
> >>> distortion cancellation in OTA filters (for similar signal levels at OTA
> >>> input / diff pair input) is so effective that any distortion in the
> >>> resonance feedback loop dominates the behaviour.
> >
> > Simply put, if you have 4 pole moog ladder and 4 pole OTA filter set up so 
> > that the filter core input voltages (after resistor ladder) are same, the
> OTA 
> > is much cleaner. Therefore at self oscillation / high resonance the signal 
> > level is higher than in Moog and any clipper in resonance path has higher 
> > effect than in Moog.
> 
> They say a picture says more than a thousand words:
> http://www.acoustics.hut.fi/~ajhuovil/selfosc.png
> 
> That is a simulation of filter in self oscillation starting as Moog and 
> then switching to OTA at halfway. The only nonlinearities are in the 
> filter core.
> 
> 0.5 on y scale = Vt = 25mV
> 
> Antti
> 
> "No boom today. Boom tomorrow. There's always a boom tomorrow"
>    -- Lt. Cmdr. Ivanova
>