[SI-LIST] Re: AC termination
- From: "#CHUANG KENG HUA#" <S7572888C@xxxxxxxxxx>
- To: "David Instone" <dave.instone@xxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Fri, 17 Feb 2006 00:02:14 +0800
Hi,
Thanks Dave.
Initially, it looks no different to me but after considering about all other
parameters and I was a bit confused. Well, Steve is right, I might look into
the basic model again.
Thanks folks.
Regards,
kenghua
________________________________
From: David Instone [mailto:dave.instone@xxxxxxxxxx]
Sent: Fri 2/10/2006 5:48 PM
To: #CHUANG KENG HUA#
Cc: si-list@xxxxxxxxxxxxx
Subject: Re: [SI-LIST] AC termination
If that was all there was to it then there would be no difference.
However, assuming that you have a plane under these components then
adding in the parasitic capacitance of the components and their mounting
pads to this plane shows a difference.. Obviously how much of an effect
depends on the frequency content of the signal. The differences are
easily visible on a TDR.
In the first case you have Cp to ground then series C with another Cp to
ground, then Cpr (Cp of the resistor) to ground then series R
In the second case you have Cpr to ground, then series R another Cpr to
ground, then Cp to ground, then series C.
Regards
Dave
#CHUANG KENG HUA# wrote:
>Hi there,
>
>
>What will be the effect of having the capacitor swapped with the resistor in
>series with AC termination?
>
> | |
> | |
>--- >
>--- OR >
> | >
> > |
> > ---
> > ---
> | |
>GND GND
>
>Regards,
>kenghua
>
>
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