[sdiy] Re: current mirrors

[jh.]

> > > Well, the current transfer ratio of a mirror depends basically
> > > on current gain.
> >
> > Is this true ?
>
> Yes.

[...]

> if we assume matched transistors, we can assume

> I   = I
>  B1    B2

Well, the point of this all was the effect of transistor mismatch.
If Vbe1 = Vbe2, but the transistors are different, Ib1 != Ib2.


> You can then vary this theme further. All this was naturally done with
> a very simple model, but it is sufficient to show the general behaivour.

Yes, what you show is the remaining error as a function of beta
even for perfectly matched transistors.

JH.