[SI-LIST] Re: Ringing in Lumped & Distributed Circuits
- From: "Luciano Boglione" <l.boglione@xxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Tue, 17 May 2011 08:53:18 -0400
Rajan,
You are posing an interesting question. This is my take:
- In the RLC case, I would assume that you are referring to a standard
analysis of a lumped RLC circuit when the source is a step voltage or an
impulse. Whatever the case, you are analyzing a linear circuit in the
Laplace domain
- In the TX line case, I would assume that you are referring to a standard
analysis under sinusoidal excitation in the frequency domain
The first point you ought to consider is to make sure you are making a
consistent comparison (the famous apple to apple comparison). The second
point is that under similar conditions, you will observe similar responses
(e.g. ringing).
Looking forward to reading more responses.
Regards,
Luciano
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Scott McMorrow
Sent: Tuesday, May 17, 2011 7:56 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Ringing in Lumped & Distributed Circuits
Rajan
Pozar, in his book, Microwave Engineering, has a chapter on resonance
and covers both lumped circuit resonators and transmission line
resonators. Both lumped and distributed circuits resonate.
regards,
Scott
Scott McMorrow
Teraspeed Consulting Group LLC
121 North River Drive
Narragansett, RI 02882
(401) 284-1827 Business
(401) 284-1840 Fax
http://www.teraspeed.com
TeraspeedR is the registered service mark of
Teraspeed Consulting Group LLC
On 5/17/2011 7:35 AM, Rajan Hansa wrote:
> Hello Steve,
>
>
> Thanks for your reply but I am sorry that I am not able to relate it with
> electrical circuits.
>
>
>
> Do you mean to say that distributed electrical circuits ring even if it's
> properly terminated ?
>
>
>
> Does ringing phenomenon ( overshoot& undershoot) in lumped circuit is
> different than distributed circuit ?
>
>
>
> Rgds,
>
> Rajan
>
>
> On Tue, May 17, 2011 at 4:53 PM, steve weir<weirsi@xxxxxxxxxx> wrote:
>
>> Rajan,
>>
>> Distributed networks most definitely can and do ring. Earth's atmosphere
up
>> to the ionosphere makes a great example: the Schumann Resonance at just
>> under 8Hz.
>>
>> Steve
>>
>>
>>
>> On 5/17/2011 3:53 AM, Rajan Hansa wrote:
>>
>>> Hello Experts,
>>>
>>>
>>> I have a problem understanding ringing concept in lumped and distributed
>>> circuits. What I have learned that lumped circuits may or may not ring
>>> depending on the Q of the circuit but distributed circuits with
terminated
>>> load will not have any ringing.
>>>
>>>
>>>
>>> where Q for RLC circuit = (L/C)1/2 /R
>>>
>>>
>>>
>>> I would like know :
>>>
>>>
>>>
>>> 1) Why Q is not important in distributed circuits ? If it's
important
>>> then how termination resistor affects Q in distributed circuit ?
>>>
>>>
>>>
>>> 2) Is ringing phenomenon ( overshoot& undershoot) in lumped
circuit
>>> is
>>> different than distributed circuit ?
>>>
>>>
>>>
>>> Rgds,
>>>
>>> Rajan
>>>
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>> --
>> Steve Weir
>> IPBLOX, LLC
>> 150 N. Center St. #211
>> Reno, NV 89501
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>>
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>>
>>
>>
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