[SI-LIST] Re: Why Termination at Both End ?
- From: steve weir <weirsi@xxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Wed, 10 Aug 2011 01:43:02 -0700
On 8/10/2011 12:13 AM, Rajan Hansa wrote:
> Thanks everyone for clearing my doubt !!
> I have one more question, I know it may look silly and is very basic but I
> am sure experts here can enlighten me. Can anyone explain that why it’s
> said that transmission line can be modeled as distributed RLGC model ?
Because with a sufficient number of sections the model accuracy is
sufficient to reliably predict Tx line behavior.
> Ok I
> know distributed model has high bandwidth but why distributed ckt has more
> bandwidth than lumped ckt ?
It doesn't.
> Why minimum 10 LC sections are needed for
> transmission line ?
That's not correct.
>
>
> Rajan
>
Many excellent texts and web references are available for you to learn
about transmission lines.
> On Tue, Aug 9, 2011 at 3:55 PM, Rohit MISHRA<rohit.mishra@xxxxxx> wrote:
>
>> Rajan,
>>
>> Here's my 2 cents :
>>
>> I believe you can use a receiver without matching it's input impedance with
>> transmission line impedance But Only If the system satisfies these
>> conditions :
>>
>> 1) Transmitter is connected to single receiver.
>> 2) Transmission line is a controlled impedance line and has no
>> unintentional impedance discontinuities(like via, stub, package lead, etc)
>>
>> In real system even though board is designed with controlled-impedance
>> traces, there is still the opportunity for a signal to see an unintentional
>> impedance discontinuity and in this case just source termination won't stop
>> the ringing that's why termination at both end.
>>
>> Rohit
>>
>>
>>
>> -----Original Message-----
>> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
>> On Behalf Of Rajan Hansa
>> Sent: Tuesday, August 09, 2011 1:57 PM
>> To: si-list@xxxxxxxxxxxxx
>> Subject: [SI-LIST] Why Termination at Both End ?
>>
>> Experts,
>>
>> Can anyone explain that why in some designs we see source as well as load
>> terminations, I mean termination at both side of traces ? If ringing is a
>> issue then only source termination should be sufficient to control it and
>> we
>> can use a receiver with very high input impedance i.e. no need to match
>> input impedance of receiver with transmission line characteristics
>> impedance.
>>
>> Rajan
>>
>>
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