Poly-Si resistors aging for a ratio

[faf]

Hello,

I find aging figure for poly-Si resistor (variation=0.7% after 300h at 150C), but I don't find any data on variation for a resistor ratio (=variation between both resistor).

Do you have an order of magnitude for resistor ratio aging ?

Thanks

 

[leo_o2]

If they are matched well, the ratio should be kept same.

 

[faf]

Do you have some experience ? For exemple when you match your resistor ratio at 1 ‰ to have a gain accuracy of 1 ‰ do you think your gain accuracy will be 1‰ after 5 or 10 years ?

I guess but I 'm not sure that the gain will move from 100-1‰ to 100-2‰ for exemple, do you agree ?

thanks

 

[leo_o2]

I think it depends on the accuracy and possibility.
In general case, most IC in well design will work for 10 years.