How do you LP wo/caps?
danial stocks
diode at hotmail.com
Fri Jul 28 10:13:05 CEST 2000
> > > > I am not sure what I have done! But on my bench right now
> > > > is a 2 stage (pole?) LP filter that sounds much better than
> > > > most of the 2 or 4P LP group that has no caps!
>
> > > So, hand over the topology for the eager one! ;)
Yeh, go on , we're all dying to know!..
note also that any internal caps made by pn junctions etc are not
particularly linear vs bias vtg.. varactors usually have some oddball cap vs
vtg curve... so does this thing have a nice expo or linear response?? also
note the caps in the chip junctions are gonna be really small vals so if
this is the contributing phenomenon then with a frq down to the Hz range
there must be some very high impedance / low current points in the circuit
coming into play.. ie a 10 pf cap with 10M res gives a time const of 0.1 ms
[10khz 3db pint] does anyone actually have any figures as to what sort of
stray cap vals you could expect from chip internals>?
Cheers,
Dan
[also notice the amt of unsubscribing going on lately?? hmm..]
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