AW: [sdiy] discrete SSM2018?

[Czech Martin]

1:0 for Haible. There is really no reason why this should work.
Except for temperature dependence, but also this is not valid.


m.c.

> -----Ursprüngliche Nachricht-----
> Von: jhaible at t-online.de [mailto:jhaible at t-online.de]
> Gesendet: Montag, 5. November 2001 17:46
> An: Czech Martin
> Cc: diy (E-Mail)
> Betreff: Re: [sdiy] discrete SSM2018?
> 
> 
> 
> > btw.: also a differential mode is possible : 13700 ota 
> > pair, 
> > one drives inverting, the other not. Guess: dc offset may 
> > cancel 
> > at the output (diff amp).
> 
> ... assuming both OTAs have more or less the same offset voltage.
> Is this realistic ?
> I know the 13600 has a tight matching of *gm* for both amps, but
> why would the vos be matched as well ? (Excuse my ignorance about
> chip design, but I'd expect if they manage to build two amps
> with almost perfect matching of two vos of two amps, they should be
> able to build a single amp with much lower vos with the same 
> technique,
> shouldn't they ?)
> 
> JH.
>