Hi Anguraj, about C_comp value issue, I only like to say that in Ver4 Cookbook there is a link to pdf document described so called L-tank method (http://www.eda.org/ibis/summits/jun02/hegazy.pdf by Hazem Hegazy). I use it and I think it makes sense. In this method the frequency dependence of C_comp is omitted and you get one single value of C_comp (you should still vary DC bias and corner conditions, of course) calculated from resonance equation. I do it with HSpice, feel free to ask me if you need help with this. regards, Dmitry Anguraj_Kothandapani-b05108 wrote: > Hi Sudharshan, > > Thanks a lot for your response! > > 1 & 2) I tried searching for the keywords in cook book but in vain.Could > you help me point to the docs/pdfs where I can get all these special > keywords. > > 3) I followed sec 4.7 of IBIS cook book to generate the C-Comp for drivers > 1. Vary P,V (voltage input to data in), T > 2. Find the max and min and add them to tables > 3. Avg becomes the typ for C-comp > > Should I change this methodology? > > Once again thanks for your inputs! > > Thanks, > Anguraj > > Sudarshan Honnudike wrote: > >> >> Hi Anguraj, >> >> I asked similar questions sometime back, but even I didnt get the >> answers. I will try to answer to your first 2 questions >> based on my experience. >> >> 1. Vdiff value can also be specified under [Receiver Thresholds] >> keyword. So if you have, say 2 speed modes of operation >> you need to have two [Model]'s for those 2 modes. As these two modes >> will have separate [Receiver Thresholds] section >> you can define 2 separate Vdiff under these 2 modes. The corresponding >> parameter to define Vdiff under [Receiver Thresholds] keyword is >> >> Vdiff_ac = >> >> 2. Similarly Common mode range can be specified under [Receiver >> Thresholds] keyword. The parameters corresponds to common mode >> range under [Receiver Thresholds] is >> >> Vcross_low = >> Vcross_high = >> >> For the third question , what i can suggest you is, to check the value >> what you are getting with the datasheet. That should confirm the >> correctness. >> Normally we vary the process corner and voltage applied to get the >> typ, min and max values of C_comp. >> >> Let me know if you find these answers helpful. >> >> Best Regards, >> >> Sudarshan HN >> NXP Semiconductors/CTO /PLT >> C-4, Manyata Tech Park, Nagawara >> Bangalore-560 045 , India. >> Ph:+91-80-40267073 >> Fax: +91-80-4026 7855 >> seri:sudarsha@inpsblr >> E-mail: sudarshan.honnudike@nxp.com >> >> >> >> >> >> >> >> *Anguraj K <b05108@freescale.com>* >> >> Sent by: >> owner-ibis-users@server.eda.org >> >> 2007-02-02 04:00 PM >> >> >> To >> ibis-users@server.eda.org >> cc >> >> Subject >> [IBIS-Users] Modeling Diff Buffers >> Classification >> >> >> >> >> >> >> >> >> >> >> >> Hi Experts, >> Could you please answer my below questions? >> >> 1. If vdiff value varies for diff pins (due to diff modes of operation, >> namely speed), How do I define that in IBIS models. >> Through [Diff Pin] keyword, we can pass only one value to vdiff. >> >> 2. How to define common mode value in the diff signals? (I believe there >> are other IBIS users who raised the same question some time earlier) >> >> 3. When measuring C-Comp for drivers, >> I see three main variables on which die cap depends on. >> 1. Freq of operation >> 2. Data value (0 to vdd) to be sent >> 3. Process corners >> >> I vary these three variables and finding the max and min value for >> C_comp. Is that right? >> But, I usually see very huge die-cap for the drivers(unrealistic) >> >> >> >> >> >> >> -- >> This message has been scanned for viruses and >> dangerous content by MailScanner, and is >> believed to be clean. >> >> -------------------------------------------------------------------- >> |For help or to subscribe/unsubscribe, e-mail majordomo@eda-stds.org >> |with the appropriate command message(s) in the body: >> | >> | help >> | subscribe ibis <optional e-mail address, if different> >> | subscribe ibis-users <optional e-mail address, if different> >> | unsubscribe ibis <optional e-mail address, if different> >> | unsubscribe ibis-users <optional e-mail address, if different> >> | >> |or e-mail a request to ibis-request@eda-stds.org. >> | >> |IBIS reflector archives exist under: >> | >> | http://www.eda-stds.org/pub/ibis/email_archive/ Recent >> | http://www.eda-stds.org/pub/ibis/users_archive/ Recent >> | http://www.eda-stds.org/pub/ibis/email/ E-mail since 1993 >> > > > -- > This message has been scanned for viruses and > dangerous content by *MailScanner* <http://www.mailscanner.info/>, and is > believed to be clean. -- +----------------------------------------+ | Dimitry Eisenshtat | | Circuit Design Engineer, | | Winbond Israel | | mailto:Dimitry.Eisenshtat@winbond.com | +----------------------------------------+ =========================================================================================== The privileged confidential information contained in this email is intended for use only by the addressees as indicated by the original sender of this email. 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