[SI-LIST] Crosstalk between the positive end and negative end of differential pair
- From: icer world <icermail@xxxxxxxxx>
- To: SI LIST <si-list@xxxxxxxxxxxxx>
- Date: Mon, 11 Apr 2011 02:50:45 -0700 (PDT)
Hi Experts:
In Eric's book, the crosstalk between the positive end & negative end of
the differential pair is discussed. I have a question about it.
The FEXT nosie is due to the different speed of odd & even and the formula
is V*(L/RT)*0.5*(1/Vodd-1/Veven). Take DDR for example, the L is 2in and the
RT=0.1ns and V is 1.8v, the noise will be 200mv and it's too much. This means
the single end of the differential pair always has much noise in high speed
design. However, this is a strange conclusion, so can someone tell me whether
it's right or not?
Thanks in advance.
Thanks
Icer
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