[sdiy] Speaking of OTAs/Matched Pairs????

[Jim Patchell]

    The original poster had listed parts on a single die, I assumed that was
understood (I guess I should not have thrown in the quip about the 2n3904's to
confuse things), but I stand by what I said.  The main difference between a
MAT02 and a CA3046 is mostly Rbe (and maybe tighter speces on Vbe).

    -Jim

Paul Schreiber wrote:

> >     The main advantage of a matched pair like the MAT02 is the low
> > emmiter bulk resistance (Rbe).  I may or may not change my opinion on
> > that (currently, I am a firm believer in premium matched transistors),
> > as my belief system has been pretty thoroughly shaken by the realization
> > that you can buy a bag of 2n3904's and have most of them be withing a
> > couple of hundred microvolts of each other,
>
> Nope.
>
> The main benefit is that the transistors are on the same die, meaning the
> same
> temperature, meaning "matched" Vbe. This results in matched Ic.
>
> Or, going "backwards", for a fixed Ic, a matced set of Vbe drops.
>
> Paul S.