[SI-LIST] Re: Return loss measurement on differential signals

Arun
I suggest that you use the Agilent website as a resource.  There are 
many papers on these subjects there.

regards,

Scott


Arun kumar P N wrote:
> Hi Steve,
>
> Thanks for your reply.
>
> Can you reply in details? and if you have docs please forward to me. I will
> go through it.
>
> Arun Kumar
>
> -----Original Message-----
> From: steve weir [mailto:weirsi@xxxxxxxxxx] 
> Sent: Monday, April 13, 2009 7:36 PM
> To: Arun kumar P N
> Cc: si-list@xxxxxxxxxxxxx; anuj.singh@xxxxxxxxxxxx
> Subject: Re: [SI-LIST] Return loss measurement on differential signals
>
> For differential signals you need to do four port measurements.  The 
> poor man's solution is to use baluns.  This adds error sources that need 
> to be corrected and is limited to the linear range of the baluns.
>
> Steve.
> Arun kumar P N wrote:
>   
>> Hi all,
>>  
>>
>> I had gone through the details about return loss measurement and relation
>> between VSWR(Voltage standing wave ratio) & reflection coefficient in
>> Google.
>>
>>  
>>
>> Return loss = -20log (Vr/Vt)
>>
>> Where,
>>
>> Vr- Amplitude of reflected wave
>>
>> Vt- Amplitude of Transmitted wave
>>
>>  
>>
>> ñ  magnitude of   Ã 
>>
>> ñ = | Ã | .
>>
>>  
>>
>> Relation between VSWR(Voltage standing wave ratio) and reflection
>> coefficient.
>>
>> VSWR = (1 + ñ)/(1 - ñ)
>>
>>  
>>
>> Will this equations applicable for differential signals?, if I am going to
>> measure Signal P with respect to Signal N in the differential pair.
>>
>>  
>>
>> If you would have any alternate solution to measure return loss of
>> differential signal, please suggest me.
>>
>>  
>>
>> Thanks & Regards,
>>
>>  
>>
>> Arun Kumar  P N
>>
>>  
>>
>>  
>>
>>  
>>
>>
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>
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>   

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