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HOW to compare two phase width in same signal wire?（difference is ps level）？
_____________|—--|___________________|--------|_____________
--45ps-- ----50ps--------
any one have idea??
Thanks,
Thanks, The difference is less that a unit delay(buffer delay), so this is not good way. currently I just use two different size buffer chains, we can utilize the different between two buffers to capture the difference. But this ciruit is too big, I want to find a simple method to do it.
Best...
Yes. now we use two buffer chains which one is smaller, one is bigger. then connect a to small one. b to bigger one. then connect buffer output to FF. then compare the value to two FF groups. this method will take big area. also the setup/hold time will effect the accuracy.
any one have...
as below:
signal a______________|-----------------------|__________________
signal b___________________|-------------------------|___________
- Ta - - Tb -
Ta,Tb are less than 100p, Ta, Tb are changing when others signals are changing...
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