Tempco Update (good news)

[gstopp at fibermux.com]

     Hey tempco thread....
     
     I dug up an "everything you always wanted to know about tempcos" blurb 
     out of Electronotes. It's just over two solid pages of text and math 
     and I can fax it to whoever wants a copy. It deals with why you want 
     one in the first place, how to use them in series with non-tempcos if 
     you don't have +3300ppm units, and where to put them in CV summers, 
     but it doesn't talk about inductive versus non-inductive types. Oh 
     well, it's good stuff anyway.
     
     Maybe I can type it all into a post so it can be archived....
     
     Anyway the fax is always an option.
     
     - Gene
     gstopp at fibermux.com


______________________________ Reply Separator _________________________________
Subject: Tempco Update (good news)
Author:  Christopher List <Christopher_List at sonymusic.com> at ccrelayout
Date:    5/14/96 10:55 AM

The only thing I'm wondering is:
Is the final effect of the tempco on the voltage at the base of the transistor 
the same when the tempco is put in here as when it's in the feedback loop of 
the op-amp? If it's not is the difference negligible? I've been too lazy to 
figure this out. Seems to me like the final effect on Vout when the tempco is 
used as Rfb is only 16ppm/C. When it's used as half of a voltage divider, it's 
effect depends on the other half of the divider. So what do you use on the 
other half? I'll play with it tonight just to see if I can get it to work, but 
I don't know how to validate the tempco effects...