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 Model file for schottky in analogLib in Cadence 

Last post Fri, May 1 2009 9:20 AM by Jim McMahon. 1 replies.
Started by Cheerful 15 Apr 2009 07:05 PM. Topic has 1 replies and 2654 views
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  • Wed, Apr 15 2009 7:05 PM

    • Cheerful
    • Not Ranked
    • Joined on Thu, Apr 16 2009
    • Posts 1
    • Points 20
    Model file for schottky in analogLib in Cadence Reply

    Hi

     i am running spectre for a circuit. The schottky requires model name. I get the following data from the schottky manufacturer and modified for spectre

    model s_diode diode
    +is=0.000182183 rs=0.0312608 n=1.40283 eg=0.576586
    +xti=0.000499955 bv=1000 ibv=0.0001 cjo=4.92728e-10
    +vj=0.573693 m=0.464284 fc=0.5 tt=1e-09
    +kf=0 af=1

     Is my langange correct? because i have a warning that says Junction current exceeds "imelt". The results computed by Virtusoso Spectre are now incorrect because the junction current model has been linearised.The Junction current exceeds "imax".

     please teach me. thank you alot for your kind teaching.

     

    • Post Points: 20
  • Fri, May 1 2009 9:20 AM

    • Jim McMahon
    • Top 500 Contributor
    • Joined on Fri, Feb 20 2009
    • San Jose, CT
    • Posts 21
    • Points 355
    Re: Model file for schottky in analogLib in Cadence Reply

    The forward or reverse current must be exceeding 1A for this diode. You can increase this limit by adding a "imax" parameter to the model:

     model s_diode diode
    +is=0.000182183 rs=0.0312608 n=1.40283 eg=0.576586
    +xti=0.000499955 bv=1000 ibv=0.0001 cjo=4.92728e-10
    +vj=0.573693 m=0.464284 fc=0.5 tt=1e-09
    +kf=0 af=1 imax=100

     The default current density limit of 1A is considered reasonible for the diode devices typically found on an IC. Of course discrete and diodes designed for high power applications may carry higher currents.

    Jim

    • Post Points: 5
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Started by Cheerful at 15 Apr 2009 07:05 PM. Topic has 1 replies.