[SI-LIST] Re: AC Coupled Signals
- From: "Mark Randol" <Mark.Randol@xxxxxxxxxx>
- To: <Chris.Cheng@xxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Mon, 24 Sep 2007 13:15:10 -0700
If I'm understanding your intent, RF designers have been doing that for
decades. This method of impedance matching is only good over a
relatively narrow bandwidth.
For pulses, bit streams, etc, unless there's a problematic harmonic or
other component that can be treated without disrupting everything else,
perhaps not a great deal of use in the 'digital domain'.
--
Mark Randol, RF Evaluation & Application Engineer
ON Semiconductor
901 S. Mopac Expressway
Barton Oaks 4, Suite 343
Austin, TX 78746
512-329-5640 (voice), 512-329-8151 (FAX)
=20
=20
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx=20
> [mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of Chris Cheng
> Sent: Monday, September 24, 2007 2:29 PM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Re: AC Coupled Signals
>=20
> There is a theory out there that claim the AC cap pad=20
> presents itself as =3D a lower impedance and thus can reflect=20
> any impedance mismatch =3D experienced by the imperfect=20
> receiver terminator or the receiving chip =3D parasitic=20
> capacitance which can be quite off at high speed from the=20
> line =3D impedance. One can take advantage of both phenomenon=20
> by adjusting the =3D placement of the AC cap pad and thus can=20
> bounce any reflection back to =3D the terminator and help (or=20
> hurt) the imperfect termination.
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