tempco resistors

[Christopher List]

>   Ya know while we're on the subject, I'd be interested if somebody 
  >   *would* open the matched-transistor can of worms! I don't think I'm up 
  >   to it.
  >   
  >   - Gene

Yes! Yes! 
If the temp-co of one transistor is cancelled by the other, where does this 
extra temp-dependancy come in?

Also, if the transistor pair is driving an OTA to control the frequency, 
doesn't the transconductance of the OTA have a temp-co? Does this affect the 
ocillator (or filter) frequency?

- Thanks,
Chris