[sdiy] AN299 VCO (was: SDIY list troubles)

[Paul Perry]

Well, I can't argue with actual measurements ;D

It is possible that the chips are selected, and the only transistors that
are checked for close matching are the pair in question - unlikely, though.
So many mysteries..

paul perry melb australia

-----Original Message-----
From: Ian Fritz 
>Maybe, but Q1 and Q2 are always way better matched than any other pair.  I 
>found this out trying to make discrete transconductors, at which time I did

>extensive measurements of matching among the transistors.  So if you are 
>correct, then it seems to me they would have to cut the dies so the matched

>pairs are always adjacent and in the same position.  Wouldn't this be 
>pretty difficult?
:-)
Ian