[sdiy] Operational Transconductance Amplifiers

[Walker Shurlds]

Interesting.  Does anyone use the tanh response intentionally for
distortion?  The best sounding digital distortion for guitar I've
encountered was tanh based...

On Tue, 9 Mar 2010 22:30:09 +0200 (EET)
Antti Huovilainen <ajhuovil at cc.hut.fi> wrote:

> On Tue, 9 Mar 2010, Andre Majorel wrote:
> 
> > "An OTA is basically a two quadrant multiplier. It multiplies an
> > input voltage by a control current and produces a current as its
> > output. The OTA's transfer function is that of a differential
> > transistor pair, which is pretty convenient, although, a bit tough
> > to analyze."
> 
> Or to put it in very basic maths:
> Iout = Iabc * tanh(Vin / 2Vt)
> Vt = ~26mV (kT/q)
> 
> No need to bother with gm or unexplained constants.
> 
> Antti
> 
> "No boom today. Boom tomorrow. There's always a boom tomorrow"
>    -- Lt. Cmdr. Ivanova
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy