[IBIS-Users] Re: Question about differential pair buffer

   Hi Arpad,

      My question is related to the pullup I-V curve, and the differential 
pair is not an open collector device. It has a load that consists of a pair 
of resistors. Also, I have another question: If I want to extract the pullup 
I-V curve, Do I have to connect the dc voltage source (the voltage source 
that sweeps from -Vcc to 2Vcc) between one of the outputs and Vdd or Vos? 

     Best Regards, 

     Ramiro

Muranyi, Arpad escribió: 

> Ramiro, 
> 
> Your question is not entirely clear to me.  Are you talking
> about the pullup I-V curve, or the waveforms (V-t) curves? 
> 
> In case you are talking about the pullup I-V curve, the next
> question is: is this differential pair open collector?  I.e.
> is there absolutely nothing on the top side in the buffer?
> If that is the case, you can omit the [Pullup] I-V table
> all together. 
> 
> Arpad
> ============================================================ 
> 
> -----Original Message-----
> From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On Behalf Of RODRIGUEZ_LECONA_RAMIRO
> Sent: Monday, June 06, 2005 10:58 AM
> To: ibis-info@eda.org; ibis-users@eda.org
> Subject: [IBIS-Users] Question about differential pair buffer 
> 
> Hi all,  
> 
>     If I want to model an buffer that consists of an BJT (npn) differential 
> pair, Does it make sense to refere the pullup curve to Vcc? (Because I don't 
> have pullup structures).  
> 
>   Best Regards,  
> 
>   Ramiro
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