[SI-LIST] Re: Damped voltage oscillation

Dear Zhangkun,

Changing the inductor to a resistor helps to dampen the oscillation and
ringing.  However, the effectiveness of filtering at low frequencies also
goes down.  Often a better approach is to use a ferrite bead, which
intentionally becomes lossy at higher frequencies.  The lower DC resistance
allows for a higher DC current, and its increasing high-frequency AC loss
will prevent ringing.

Best regards,

Istvan Novak
SUN Microsystems

----- Original Message -----
From: "Zhangkun" <zhang_kun@xxxxxxxxxx>
To: <ueda@xxxxxxxxxxxx>; "silists" <si-list@xxxxxxxxxxxxx>
Sent: Sunday, June 22, 2003 7:58 PM
Subject: [SI-LIST] Re: Damped voltage oscillation


> Dear Ueda
>
> In our product, there is simular situation. When the isolating bead is
change to resistor, the resonance of power is disappear. I think this is
because the resonance frequency of OSC and decoupling circuit are coincide.
When the bead is changed to resistor, the Q of decoupling circuit is lower.
>
> Changing the capacitance or inductance may be one kind of solution. The
resonance frequency will change.
>
> I hope I do not miss your expression.
>
> Best Regards
>
> Zhangkun
> 2003.06.23
> ----- Original Message -----
> From: <ueda@xxxxxxxxxxxx>
> To: "silists" <si-list@xxxxxxxxxxxxx>
> Sent: Sunday, June 22, 2003 4:39 AM
> Subject: [SI-LIST] Damped voltage oscillation
>
>
> > Hi, ALL
> > Does anyone know the example which damped voltage oscillation?
> > The resistor is connected with the series in decoupling capacitor to
insert
> > between power(vdd) and ground (gnd).
> > Don't you know the paper, the materials?
> > Chihiro Ueda
> > AET japan INC
> >
> >
> > *************************
> > Engineering Division
> > Chihiro Ueda
> > AET JAPAN, INC.
> > URSIS Bldg. 9th Floor
> > 1-2-3 Manpukuji, Asaoku,
> > Kawasaki-City,215-0004Japan
> > TEL:81-044-966-9981
> > FAX:81-044-951-1572
> > mailto:ueda@xxxxxxxxxxxx
> > http://www.aetjapan.com
> > *************************
> >
> >
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