This is in response to Ken's and Bob's emails regarding the scaling capabilities in the IBIS buffer building blocks of the macro library. Looking at my code, it seems that it would be very easy to add these capabilities to the models. I thought the best would be if it was compatible with the HSPICE B-element's scaling parameters, which are: pu_scal pd_scal pc_scal gc_scal for the IV curves, and rwf_scal fwf_scal for the Vt curves. The IV coefficients curves scale (multiply) the current of the corresponding IV tables. The waveform coefficients scale (multiply) the time axis of the Vt tables, effectively speeding up or slowing down the edge rates. Notice that the rising and falling edges are all scaled by the same number to keep the Vt tables time correlated within a group. Are there any oppositions or suggestions before I implemented these? Thanks, Arpad =========================================================== -----Original Message----- From: Bob Ross [mailto:bob@xxxxxxxxxxxxx] Sent: Sunday, February 05, 2006 3:16 PM To: kwillis@xxxxxxxxxxx Cc: Muranyi, Arpad; ibis-macro@xxxxxxxxxxxxx Subject: Re: [ibis-macro] Re: Suggestion for a new macro library element Hi: I support the concept of scaling, especially for all I-V tables because the tables are referenced to specified voltages in a manner that corresponds to physical scaling of strengths. If V-T scaling is used, it should be scaled by a first order linear equation y = ax + b to add tranlation so that the time response is scaled with respect to a proper start of transition time. I like and have also used scaling. However, there are some technical implications and unexpected interactions, some of which I will mention at the IBIS Summit. Bob Ken Willis wrote: > Hi, > > We use the VI scaling quite a bit in our SPICE-based behavioral > MacroModeling, > and have found it very useful. > > Ken --------------------------------------------------------------------- IBIS Macro website: http://www.sisoft.com/ibis-macro IBIS Macro archives: //www.freelists.org/archives/ibis-macro To unsubscribe send an email: To: ibis-macro-request@xxxxxxxxxxxxx Subject: unsubscribe