[SI-LIST] Re: Parallel Inductor in Capacitor !!!
- From: steve weir <weirsi@xxxxxxxxxx>
- To: Rohit MISHRA <rohit.mishra@xxxxxx>
- Date: Fri, 13 May 2011 00:25:56 -0700
Rohit, inductance, capacitance, resistance, and conductance are abstract
properties. They are very useful to understand concepts and dominant
behaviors.
Objects in the real world don't consist of lumped R-L-C-G elements.
Passive linear devices exhibit behaviors that can be usefully
approximated with models built using combinations of R-L-C-G elements.
The more precisely we wish to model and the wider the frequency range we
wish to represent real device behavior across, the more R-L-C-G elements
we need to put in the models. That particular model happens to have
five branches. At some loss in accuracy it could have had fewer branches.
Steve.
On 5/12/2011 11:57 PM, Rohit MISHRA wrote:
> 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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