somisetty wrote on Jan 26th, 2010, 9:42pm:i have few doubts...in the cosmoscope settings of yours ..
you took ideal trigger not the default,would pls let me know why only ideal trigger?
Attached is a function for eyediagram plot in Cadence Post Processing Environment.
You can see arguments of "eyeDiagram()" are almost same as arguments for "Ideal trigger" in CosmosScope.
The following is a function for eyediagram plot in Agilent Post Processing Environment.
http://edocs.soco.agilent.com/display/ads2009/eye%28%29If you compare these functions from two vendors with eydiagram menu in CosmosScope,
you can understand that "Ideal trigger" is very common function for eyediagram.
somisetty wrote on Jan 26th, 2010, 9:42pm:how does start x value be calculated?(10n in the 1st setting and 48n in the 2nd setting..)
"Start X value" is used for same purpose as "Delay" in Agilent Post Processing Environment.
I determined 10nsec and 48nsec by balancing right and left in eyediagram.
"Time base" is used for same purpose as "Cycles" in Agilent Post Processing Environment.
Why do you set "Trigger value" as 0 in "Default" ?I don't think it is proper value.
If you use "Default" and use "fs_dm" as "Ref. signal", you should set 0.5~0.6V as "Trigger value".
Also you had better set relative large value(e.g. 200nsec>>83nsec) as "Time base".
somisetty wrote on Jan 27th, 2010, 12:40am:pancho_hideboo wrote on Jan 26th, 2010, 3:11am:BTW, why does the flat part around 1.5V exist in output waveform ?
i think it might be due to transmission line...
I don't think your answer make sense.