[SI-LIST] Re: Electrical Length?
- From: "Traa, Boris" <boris.traa@xxxxxxxxxxx>
- To: Sanjeev Gupta <sanjeev.gupta@xxxxxxxxxxxxx>
- Date: Wed, 30 May 2012 15:21:35 +0000
Dear mr. Sanjeev Gupta
If you take e.g. a strip line terminated with another impedance than its
characteristic impedance than the phase_shift/(freq*360) is not constant but
frequency dependent, while the electrical length should remain constant.
Kind regards
Boris Traa
System design engineer EMC
It's the currents that make circuits work or fail.
Philips Innovation Services/EMC center
Room 2.020
High Tech Campus 26
5656AE Eindhoven, The Netherlands
Tel: ++ 31 40 27 43766
Fax: ++ 31 40 27 42224
E-mail: boris.traa@xxxxxxxxxxx
-----Original Message-----
From: Sanjeev Gupta [mailto:sanjeev.gupta@xxxxxxxxxxxxx]
Sent: Wednesday 30 May 2012 4:11 PM
To: Traa, Boris
Cc: si-list@xxxxxxxxxxxxx; sanjeev.gupta@xxxxxxxxxxxxx
Subject: RE: [SI-LIST] Re: Electrical Length?
Hi Traa,
If it is a stripline configuration, the phase shift for a given physical length
remain same wrt to impedance. If you have microstrip structures than it will be
a different story and you may require effective dielectric constant in order to
compute phase shift.
For VNA measurement one can renormalize S-parameters for different termination
values as a post processing step.
I hope this helps!
Sanjeev Gupta
Sr. Signal Integrity Technical Lead
Avago Technologies
-----Original Message-----
From: Traa, Boris [mailto:boris.traa@xxxxxxxxxxx]
Sent: Wednesday, May 30, 2012 2:06 AM
To: sanjeev.gupta@xxxxxxxxxxxxx; aaditya.kandibanda@xxxxxxxxx
Cc: si-list@xxxxxxxxxxxxx
Subject: RE: [SI-LIST] Re: Electrical Length?
Dear Sanjeev Gupta,
How do you measure the phase shift that you would use for determining the
electrical length in a non 50 Ohm system?
Kind regards
Boris Traa
System design engineer EMC
It's the currents that make circuits work or fail.
Philips Innovation Services/EMC center
Room 2.020
High Tech Campus 26
5656AE Eindhoven, The Netherlands
Tel: ++ 31 40 27 43766
Fax: ++ 31 40 27 42224
E-mail: boris.traa@xxxxxxxxxxx
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Sanjeev Gupta
Sent: Wednesday 30 May 2012 6:01 AM
To: aaditya.kandibanda@xxxxxxxxx
Cc: si-list@xxxxxxxxxxxxx; sanjeev.gupta@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Electrical Length?
The electrical length of a transmission line is equivalent to unwarp phase
change from input to output at the specified frequency. If the electrical
length is specified than one can compute physical TX line length providing
exact phase shift @ defined frequency. One can compute electrical delay from
electrical length as electrical_length/(freq*360) or in other words
phase_shift/(freq*360).
You can search for TRL Calibration Application Notes on Agilent Website and you
will find many examples using electrical length for VNA TRL Calibration Kit
design.
I hope this helps!
Sanjeev Gupta
Sr. Signal Integrity Technical Lead
Avago Technologies
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Mervin J
Sent: Tuesday, May 29, 2012 7:57 PM
To: aaditya.kandibanda@xxxxxxxxx
Cc: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Electrical Length?
Aaditya,
Electrical length(in lamda).i.e., wavelength is the distance the wave must
travel in order to shift its phase by 2*pi radians or 360 degree. It is
calculated in wave vs position in space plot at fixed time.
Mervin J
On 5/30/2012 4:30 AM, Bert Simonovich wrote:
> Aaditya,
>
> Think wavelength (lambda).
>
> Period of wave (sec) x velocity (m/sec) = electrical length of wave (m).
>
> Bert Simonovich,
>
> Sent from my iPhone
>
> On 2012-05-29, at 6:29 PM, Aaditya
Kandibanda<aaditya.kandibanda@xxxxxxxxx> wrote:
>
>> Hello Everyone,
>> I came across this concept called Electrical length, Could anyone
>> please explain me when, how and why is electrical length used?
>>
>> Thank you!
>> Aaditya
>>
>>
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