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https://designers-guide.org/forum/YaBB.pl Modeling >> Transmission Lines and Other Distributed Devices >> S-param accuracy issue during Spectre transient simulation of low coupling induc https://designers-guide.org/forum/YaBB.pl?num=1596557306 Message started by Aman101 on Aug 4th, 2020, 9:08am |
Title: S-param accuracy issue during Spectre transient simulation of low coupling induc Post by Aman101 on Aug 4th, 2020, 9:08am Hi, I am simulating a 4 port S-param file of two inductors with weak coupling between them (about -110dB). First inductor: ports 1-2 Second inductor: ports 3-4 Nport settings: interp=linear, imptrunc=1.0e-6 Frequency: 0 : 100MHz : 300GHz Simulation is comprised of a voltage source across port 1-2 while measuring voltage across ports 3-4. Simulation is performed in AC and Transient (setting a pure 1V sinusoidal signal at 14.5GHz). AC response is very smooth without any strange unexpected artifacts. Tran response is converged without any blow-up artifacts. Unfortunately, Tran response is 4 times the AC @ 14.5GHz!!! I suspect it is originated from Spectre Impulse Response calculation. Therefore I set the following Nport settings: imptrunc=1.0e-12 imptrunc=0 datatrunc=0 All did not alter the results much. When using S-param of stronger coupling between the inductors (-80dB), Tran and AC are identical! using bbspice only makes things worse... What are the Spectre settings for most accurate Impulse response? Thank You. p.s. I have read the article "7 Habits of Highly Successful S-Parameters" from 2019. |
Title: Re: S-param accuracy issue during Spectre transient simulation of low coupling induc Post by Andrew Beckett on Aug 9th, 2020, 7:18am I would suggest contacting Cadence's customer support. Andrew. |
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