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shooting vs. hb

Karev11

Hi,

From this link:

community.cadence.com/.../tip-of-the-week-when-to-use-harmonic-balance-engine-vs-shooting-newton-engine

it was recommended to use shooting for circuitry that has sharp transitions, but hb for circuitry that has s-parameters. 

My circuit has a series of buffers (sharp edge) and also s-parameter to reflect some routing so I tried both shooting and harmonic balance.  I did not notice significant difference in pss sim itself, but hb take much less time for noise analysis(i use the same no. of harmonics).  Is there a reason why?

The other observation, is that noise analysis result on the nodes along the chain of buffers are the same between hb and shooting, but for the nodes before and  after sp file, they are quite different.  Since hb is recommended for sp model, does that mean we should trust result from hb instead of shooting?  in other words, it's more an accuracy concern than efficiency ?

thanks,

Kevin

  • Karev11

    One thing I forgot to mention (which is more a correction to original statement),  is that the different noise analysis results are when my sp-model is actually a cascade of 3 lower level sp-models and each one based on extraction of 100um long route.

    However, when sp model is based on extraction of one single 300um long route, no difference in noise analysis result between shooting and hb.

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