Vinu
These standards also define as part of the transmitter
testing at least in Ethernet a Golden CDR with
loop bandwidth of 1/2500 of Baudrate. The CDR help
integrate TX SJ contribution then you make lump
sum measurement of the jitter on your favorite instrument.
If you have excess SJ the transmit test with
Golden PLL give you credit by tracking the allowed portion
and any excess will be part of the measurement,
so there is no reason beside de-bugging the transmitter to
directly measure the TX SJ.
Thanks,
Ali
On Nov 8, 2012, at 8:29 AM, Vinu Arumugham wrote:
All,
A basic spec. question ...
Most serial link electrical
specifications have a Sinusoidal Jitter (SJ) tolerance
mask for the RX.
But I have never seen a Sinusoidal
Jitter Generation mask for the TX. Why?
The interconnect cannot be the
source of all that SJ...
Thanks,
Vinu