[sdiy] Temperature compensation results

[Ian Fritz]

Rene --

At 06:48 AM 6/14/2003, René Schmitz wrote:

>>So you assume the same model equation for both transistors. I don't see 
>>the justification for this -- small offsets could be caused by small 
>>deviations from the equation.
>
>Say you would extract the parameters for a SPICE simulation, you could fit 
>XTI and EG to match with observed data. Because if you try to treat the 
>transistor numerically, you have to use a model of some sort. Thats 
>physics essentially, modelling the world arround us.

LOL!   :-)

I would say that what you are describing in engineering, not physics. You 
pick some ideal model and blindly assume it is correct.  How do you know 
you could "fit XTI and EG to match with observed data" and get a meaningful 
result as far as understanding mismatch?

Again, if the mismatch is caused by defects, edge leakage, etc., then you 
have to use model equations that include these effects.  *THAT'S* what 
physics is about.


>  To me there seems to be no fundamental difference between a pair that is 
> matched to 0.5mV to one that is matched to 50uV. At least there is none 
> that would be predicted by the Gummel Poon model.

That's circular logic. You assume an ideal model, then conclude that the 
behavior must be ideal.


>>BTW, do you know that all the mail to your address uzs159 at uni-bonn.de is 
>>bouncing?
>
>I just checked, but nothing, but Martins adress is sending an autoreply.


OK, but here's what I've been getting back:

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X-Failed-Recipients: uzs159 at uni-bonn.de
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To: ijfritz at earthlink.net
Subject: Mail delivery failed: returning message to sender
Date: Fri, 13 Jun 2003 19:55:44 -0700

This message was created automatically by mail delivery software (Exim).
A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:
uzs159 at uni-bonn.de
SMTP error from remote mailer after MAIL FROM:<ijfritz at earthlink.net>:
host node03.rhrz.uni-bonn.de [131.220.14.203]:
550 Access denied

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Best regards,

   Ian