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DC Op Pt of R-S F/F (Read 1397 times)
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Silicon Valley
DC Op Pt of R-S F/F
Sep 18th, 2008, 12:41pm
 
Hello - I'm using Cross coupled NOR gates in a couple mixed signal paths.
DC op pt seems to be a problem, as they are symmetric.  (no offsets)
Often the solution is a midpoint of VDD burning shoot thru current.

I've used spectre Nodeset on the Set/Reset inputs successfully in one case.

In another instance, there is Feedback around an analog loop, and that whole loop locks up to a mid-point.  Not sure if this is a real ckt problem (I inherited the design).

I'd prefer not to run a transient to clear the Flop.
Short of that solution, any suggestions?

thanks,
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