[SI-LIST] Re: Decoupling Using 3-Terminal Capacitor

You might want to think about parallel and series circuits.  In parallel
circuits the total impedance is less than putting the same two impedances in
series.  And, yes, yes, I know there are resonance issues that will make
that not a general case.

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Himanshu Arora
Sent: Tuesday, May 31, 2005 2:45 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Decoupling Using 3-Terminal Capacitor


Hello,
I am making a prototype PCB where in there are
multiple VDDs.

The Power Supply filter network looks somewhat like
the one shown in the figure attached in text file.
Instead of 2 terminal caps I plan to use the
3-terminal cap. The 3-terminal caps are from Murata.

The reason of using 3-terminal caps against 2-terminal
Multi-layer-ceramic caps is that they offer lower ESR
at SRF, their lead inductance is lower and their SRF
is higher for the comparable cermic cap in value and
case size. The reason I am connecting the two
3-terminal caps in series is to offer a lower
impedance across a wide range of frequencies.

I would like to have your views and inputs for the
above arrangement. Thanks.

Sincerely

Himanshu



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-- Attached file included as plaintext by Ecartis --
-- File: 3tcap.txt
-- Desc: 2302733855-3tcap.txt


        VDD                     C1              C2
                                ----            ----
        |--------Ferrite------------------------------------VDDA
        |                       ----            ----
        |                        |               |
        |                        |               |
        |                       GND             GND
        |
        |                       ----            ----
        |--------Ferrite------------------------------------VDDD
        |                       ----            ----
        |                        |               |
        |                        |               |
                                GND             GND


C2 = 2200pF (NFM21CC222R1H3)
C1 = 1uF    (NFM21PC105B1A3)

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