Re: Analog design problem
what about resistor ratio from die to die?, I mean you have R1/R2 in one die and R1'/R2' in the other chip, is (R1/R2)/(R1'/R2') close enough to one to use some circuit based in ratio not in particular values?.
another aproach could be to use some high gain block and put your variable component in the loop (to have variation divided by (1+GAIN)) and some bandgap or other stable reference to make the job.
Only ideas, I don't know if feasible