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mahboul New Member Offline Posts: 5	FBH-HBT Model Jul 28^th, 2005, 11:44am Hi All, Is someone outside there who used this model (FBH HBT by Matthias Rudolph from www.designers-guide.org ) with spectre. It's running with ADS but in spectre it's not converging. Thanks Mahboul
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Ken Kundert Global Moderator Offline Posts: 2384 Silicon Valley	Re: FBH-HBT Model Reply #1 - Jul 28^th, 2005, 11:53am Matthias just sent me a new version (2.1). You might try downloading the latest version and trying again. -Ken
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mahboul

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Re: FBH-HBT Model
Reply #2 - Jul 28^th, 2005, 12:25pm

Hi Kent,
I tried with FBH-HBT(vers.21) I got the same results.
If I use the model with the default values I got an error:
in line 412 divede by zero and
in the parameter definition in line 144 the range of Fb has to be changed to [0.0:inf).
If I use realistic parameter values it is still not converging (with the same parameters in ADS I have the expected results )
Thanks
Mahboul

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Matthias Rudolph Guest	Re: FBH-HBT Model Reply #3 - Jul 28^th, 2005, 11:30pm Hi Mahboul, the code was developed and tested with ADS only, but it should converge with every simulator! We dont have Spectre here, so I can not offer to test your simulation, but if you send me the model parameters, maybe I see something. Best regards, Matthias
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Geoffrey_Coram Senior Fellow Offline Posts: 1998 Massachusetts, USA	Re: FBH-HBT Model Reply #4 - Jul 29^th, 2005, 8:00am It might also be worth checking your version of Spectre. Are you using one of the newer releases that compiles the Verilog-A? (IC5141 or MMSIM6)
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mahboul New Member Offline Posts: 5	Re: FBH-HBT Model Reply #5 - Jul 29^th, 2005, 9:49am Hi I'm using version 4.4.6. OK I will try a newer version (If it's available) and let you know. Thanks
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mahboul New Member Offline Posts: 5	Re: FBH-HBT Model Reply #6 - Aug 1^st, 2005, 3:55am Hi Geoffrey, now the model is working. I used version 5.0.33 of spectre, Thanks!! Hi Matthias, I have now excactly the same results with spectre and ADS, Thanks Mahboul
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Geoffrey_Coram

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Re: FBH-HBT Model
Reply #7 - Apr 4^th, 2006, 8:15am

I just sent an e-mail to Matthias asking about some problems with the model.

Most of them center around the self-heating model implementation, which I believe is broken, or at least does not match the "usual" implementation of self-heating, whether in built-in models or Verilog-A code for Mextram 504, HiCUM, VBIC, etc.

I hope there will be an updated version soon.

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If at first you do succeed, STOP, raise your standards, and stop wasting your time.

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