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R extraction in Diva Cadence

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Alex_IC

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diva cadence

Hello!

I have extracted res from a layout of opamp in order to check input offset voltage with DC. But the number of res is 550,000! And simulation time is very long. How can I solve the problem?

Tnx
 

cadence diva

Hi,

Normally Spice simulators support R reduction, the algorithm constructed in such way that u won't loose much accuracy
so here is the flow
1. do simulation without R reduction, keep this results as golden ref.
2. do simulaiton with R reduction, compare it with golden calc. difference.
3. increase reduction and do simulation, compare it again.
iterate until u get better tradeoff between performance & accuracy
Use u r settings as reference for future designs.
try to keep u r results with reduction under 10% difference with golden ref.

By th way which tool r u using?

Thanks,
 

r. extraction

I'am using Cadence Virtuoso Custom IC design platform. May be I have so much parasitic R because of multiple sub connection. And I'd like to copy the layout of the opamp and remove sub connections and use the layout for extraction of R and simulation.
 

diva parasitic

As per my understanding - Cadence Diva parasitic extraction is less accurate compared to Cadence QRC/RCX. Use the later - you have several smarted ways to control r-reduction, removal of dangling R, and even finer control on fracture-length, and fracturing algorithm is conscious about width changes along the net.
 

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