How do you LP wo/caps?

[patchell]

tomg wrote:

> Harry says the simulation works! and that it's buffer
> capacitance. I'm inclined to agree. Removing the
> buffers turns it into a 2 stage vca. Why it's working
> on buffer capacitance is another question.
>

    I am surprised too...the input capacitance in a BJT follower is pretty well
boot strapped, and there would be no miller capacitance to speak of...course, it
has been a while since I have had to think about such things.

>
> cya Friday...
>
> Tom
>
> > > > I don't know if you are into SPICE but this wd solve the
> > > > question of how useful spice is or is not ;-)
> > >
> > > Eh, rather, how able he is to use spice for something....
> > >
> > > ;)
> >
> > I sent it to Harry..Let him figure it out...;-) ( if he has time that
> is..)
> >
> > > Anyways, most likely are you toying around with the dominant poles...
> > which is
> > > not a bad thing but I bet my horse (I don't own one, so thats fine) that
> > you
> > > should really go into individual trimming on this one, so I would not
> make
> > use
> > > of it in a commercial product... have you tested temperature stability
> of
> > > frequency/Q ? Power-supply stability? Do you ever test that BTW?
> >
> > Y-Yes I do..;-)
> >
> > > I would not
> > > be supprised if you would find it more sensitive than normal filters.
> > > Good or bad, well, thats another plate...
> > >
> > > Cheers,
> > > Magnus
> >
> > Me ether!
> >
> > Tom
> >
> >
> >

--
 -Jim
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