I have a resistor divider, I'm interested calculating the drift of the divider over temperature and if possible minimizing it. I was wondering if both resistors in the divider have the same value picked from the same reel, can I assume that the temperature coefficient of both resistors cancel each one out? if not how much variance can I expect between the temp coeffs? I know this relies on resistor types and ...., I just want to know if anyone has tested this and knows a ballpark for typical resistor values laying around with temp coeffs around 200ppm
I took some quick measurements, I made a divider using resistors with 50ppm temp coef. and the divider temp coef. The worse error for a divider with equal resistors would be TC/2 which would be 25ppm, the value I measured was near 10ppm so approximately 2.5 times improvement in temp coef. for my case. I only took one measurement and I know that's not statistically right but that's enough answer for me.