[SI-LIST] Re: Parallel Inductor in Capacitor !!!
- From: Rohit MISHRA <rohit.mishra@xxxxxx>
- To: "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
- Date: Fri, 13 May 2011 14:57:53 +0800
Hello Steve,
The problem is not with small 10pF capacitor, parallel inductor comes in big
capacitors too like GRM188B30J475KE18 which is 4.7 uf capacitor.
What I am trying to ask is how come parallel inductor is possible in parallel
plate capacitor geometry ? All the conductor like pins & plates come in series
with capacitor so we should see only series not parallel inductor, right ?
Rgds,
Rohit Mishra
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of steve weir
Sent: Thursday, May 12, 2011 11:37 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Parallel Inductor in Capacitor !!!
This looks like a multipole fit from S parameter data. This is just a
little 10pF capacitor. I assume you are using it for a crystal
oscillator or some such and not for power bypass.
Steve.
On 5/12/2011 8:49 AM, Rohit MISHRA wrote:
> Friends,
> Though It may look a silly one but It's really bothering me so thought to get
> view from experts.
>
> I always had an understanding that all real capacitors have a parasitic
> inductor(ESL) which will always be in series to capacitor( That's why we call
> it Equivalent Series Inductance !!! ) and this inductance comes from lead and
> plates of capacitor.
>
> But today when I downloaded a spice netlist for one murata ceramic capacitor,
> I have noticed that It has some inductors in parallel too ( L7& L8 )
>
> Can anyone help me to understand how parallel inductor is possible in real
> capacitors ??
> Here is the spice netlist for murata capacitor :
>
> .SUBCKT GRM1882C2A100JA01 Port1 Port2
> C1 Port1 11 1.01e-11 Basic capacitance
> L2 11 12 1.23e-10Part of ESL
> R3 12 13 1.00e-1Part of ESR
> C4 13 14 6.67e-10Frequency shaping branch
> R4 13 14 4.78Part of ESR, frequency shaping
> L5 14 15 6.26e-11Part of ESL, frequency shaping
> R5 14 15 3.54e-1Part of ESR, frequency shaping
> C6 15 16 7.50e-13Frequency shaping branch
> L6 15 16 3.00e-10Part of ESL, frequency shaping
> C7 16 17 3.18e-12Frequency shaping branch
> L7 16 17 8.17e-11Part of ESL, frequency shaping
> R7 16 17 9.10Part of ESR, frequency shaping
> C8 17 Port2 5.89e-12Frequency shaping branch
> L8 17 Port2 1.04e-10Part of ESL, frequency shaping
> R8 17 Port2 17.4Part of ESR, frequency shaping
> R100 Port1 11 1.00e+10Leakage resistance
> .ENDS GRM1882C2A100JA01
>
> Link of murata, if someone wanna explore it :
>
> http://ds.murata.com/software/simsurfing/en-us/index.html
>
>
> Best Rgds,
>
> Rohit Mishra
>
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--
Steve Weir
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