[sdiy] Single chip (3 opamp) wave multiplier

[jh.]

> Von: Martin Czech <czech at Micronas.Com>
>
> > At least now I understand how these AD sin/cos chips work. (schemos on
> > my site)
>
Ah - looks a bit like the Don Tillman version of the Scanner !

> Does that mean that they have only one transistor per 90 DEG?
> > That would be a pretty crude approximation.
>
You can greatly improove the approximation with a negative feedback loop
around a single-differential-pair sine shaper (The result is the same as
with emitter degradation.), so I guess the same is true for these AD
networks if (if !?) they cover several periods with a diff amp for each.

> I guess when flattening
> > is most needed another transistor stage turns on, first flattening the
> > response then turning it down again,] towards 180 DEG and so on.

This becomes better and better. Who would have thought that analog
electronics can still be so exciting after all these decades (;->).

JH.