[sdiy] Vco I did today...

[Tim Ressel]

Jim,

I don't think the J111 and 2N4391 are the same. J111
shows 1nA Idoff, 2N4391 is 0.1nA.

You're right, Rdson and Idoff tend to be exclusive.
But it makes sense; the combination can be thought of
as the dynamic range of the FET. The question I have
is: which is more important, Rdson or Idoff?

--tr

--- patchell <patchell at silcom.com> wrote:
>     I have had no problems with them.  The J111 is
> equiv (well, actually
> the same die as) the 2n4391 which has also been used
> a lot.  One thing I
> have noted about JFets is that you seem to have to
> trade Idoff with
> Rdson...for some reason, the two parameters seem to
> be mutually
> exclusive (low leakage devices seem to have a higher
> Rdson)...
> 
> Tim Ressel wrote:
> 
> > Jim,
> >
> > How's that J111 working out? I'm using one with a
> > better Idoff and am wondering how much it matters.
> >
> > --tr
> >
> > --- patchell <patchell at silcom.com> wrote:
> > >     Worked a bit on a VCO board today...here is
> the
> > > Pdf file...
> > >
> > >
> >
>
http://www.silcom.com/~patchell/synthmodules/100-1007.pdf
> > >
> > > --
> > >  -Jim
> > > ------------------------------------------------
> > > * Visit:http://www.silcom.com/~patchell/
> > > *-----------------------------------------------
> > > *I'm sure glad Merry Christmas comes just once a
> > > year
> > > * -Yogi Yorgensen
> > > ------------------------------------------------
> > >
> > >
> >
> > __________________________________________________
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> --
>  -Jim
> ------------------------------------------------
> * Visit:http://www.silcom.com/~patchell/
> *-----------------------------------------------
> *I'm sure glad Merry Christmas comes just once a
> year
> * -Yogi Yorgensen
> ------------------------------------------------
> 
> 


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