ring counter at 0.35um process

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paramis

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Hi all,
I need a ring counter with 50 latch, that worked with clock @ frequency=4.3Ghz,i use c2mos latch but it can't work correct.
one c2mos latch work correct at 4.3GHz but loop of 50th of c2mos latch didn't work.do u know any high speed latch??? i don't know why loop can't work....
the image of c2mos latch attached.
 

That is very high speed, perhaps the devices are not sized quite right for the drive loading vs speed, were you simming with parasitics? It sounds like if a single works but the chain isnt, you might have race conditions occurring, have you observed the delay from one to the next with respect of the clock input?
 

I guess that clock bus is loaded with 100 latches and (without buffer amplifiers) it's overloaded.
 
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