problems_Differential pairs

[abhi002]

Hi,

I have a few queries regarding differential pairs:

1- In differential pairs,we need to route the nets parallel.Since we can not route the nets 100% differential i.e.we can not make route 100% parallel due to the placement and pin gaps of the components.My question is the minimum % criterion(commonly used for all devices) for differential pairs.

2- Also,we have to match the lengths of differential pairs.Is it really desirable?

Regards,
Abhi

 

[Anonymous_Ricky]

Hi Abhi,

as far as pecentage is concerned i dont know how much difference in percentage is permissible.

but length match is necessary for diff_pairs as mismatch in length will cause phase difference due to the fact that with different lengths the signals will reach the destination at different times there by causing the phase difference.

regards,

Ricky

 

[Rame]

Hi,

Check this site out,it answers your query,

**broken link removed**



Regards

Ramesh

 

[tarak]

SEE IT