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Design >> Mixed-Signal Design >> DC Op Pt of R-S F/F
https://designers-guide.org/forum/YaBB.pl?num=1221766892

Message started by wave on Sep 18^th, 2008, 12:41pm

Title: DC Op Pt of R-S F/F
Post by wave on Sep 18^th, 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,
Wave
8-)