[SI-LIST] Re: Need a equation of inductance calculation for microstrip over the ground plane
- From: "Grasso, Charles" <Charles.Grasso@xxxxxxxxxxxx>
- To: "alfred1520list@xxxxxxxxx" <alfred1520list@xxxxxxxxx>, Dave Cuthbert <telegrapher9@xxxxxxxxx>
- Date: Tue, 23 Sep 2014 14:39:32 +0000
Saturn has a free PCB toolkit that reports transmission line properties. Its
equation driven - but within its constraints
might give you what you need.
Best Regards
Charles Grasso
Compliance Engineer
Echostar Communications
(w) 303-706-5467
(c) 303-204-2974
(t) 3032042974@xxxxxxxxx
(e) charles.grasso@xxxxxxxxxxxx
(e2) chasgrasso@xxxxxxxxx
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of alfred1520list
Sent: Wednesday, September 17, 2014 11:18 AM
To: Dave Cuthbert
Cc: C.C. Hwang; 王文松; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Need a equation of inductance calculation for microstrip
over the ground plane
Ah, it is obvious, the delay is for the entire length of the transmission line.
Sorry for the noise.
On September 17, 2014 8:35:04 AM PDT, Dave Cuthbert <telegrapher9@xxxxxxxxx>
wrote:
>The capacitance is the total capacitance of the t-line. Knowing the
>effective relative dielectric constant and the line length you can
>calculate the propagation delay.
>
>To check that you have calculated the correct L and C, run it thru the
>formula Z = (L/C)^0.5 and Z should be the characteristic impedance.
>
> Dave Cuthbert
>
>On Wed, Sep 17, 2014 at 8:57 AM, alfred1520list
><alfred1520list@xxxxxxxxx>
>wrote:
>
>> Hi Dave,
>>
>> Nice to know. Thanks.
>>
>> Does length play a part? Is it per unit length? What unit? Thanks.
>>
>> Best regards
>> Alfred
>>
>> On September 17, 2014 5:57:16 AM PDT, Dave Cuthbert <
>> telegrapher9@xxxxxxxxx> wrote:
>>>
>>> Song, here are my two favorite SI formulas (that's pretty geeky I
>know):
>>> C = t/Z
>>>
>>> L = t x Z
>>>
>>> The capacitance of a t-line (microstrip in your case) is the
>propagation
>>> delay divided by the line characteristic impedance.
>>>
>>> The inductance of a t-line is the propagation delay multiplied by
>the line
>>> characteristic impedance.
>>>
>>> Let's say you have a 50 ohm line and the propagation delay is 100
>ps. The
>>> capacitance is 2 pF and the inductance is 5 nH.
>>>
>>> Dave Cuthbert, Narte Certified EMC Engineer
>>> Consultant for EMC, SI, RF, Power Electronics, and most
>everything analog
>>>
>>> On Tue, Sep 16, 2014 at 9:22 PM, C.C. Hwang <cchwang2013@xxxxxxxxx>
>wrote:
>>>
>>> You can use a 2D solver (such as http://ataitec.com/free_2d_solver)
>to
>>>> compute all RLGC.
>>>> Carl
>>>>
>>>> On Sun, Sep 14, 2014 at 4:42 PM,
><wangwensong1986@xxxxxxxxx> wrote:
>>>>
>>>> Hello everyone,
>>>>> Now I want to calculate a approximate value for inductance of
>microstrip
>>>>> line over a ground plane.
>>>>>
>>>>> Anyone have any references you can send my way? I know I've been
>able to
>>>>> find this stuff in the past, but right now I'm coming up empty...
>>>>>
>>>>> Thank you.
>>>>>
>>>>> All the best,
>>>>>
>>>>> Song
>>>>>
>>>>>
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