The questions about op-amp resistors are dime a dozen, forgive me for adding another one. I am not asking how to calculate them, I know at least that much. My questions approach the problem from different perspective. Specifically - hobbyist's choices when it comes to buying specific resistors.
Case in point: I have 1.6V differential signal biased with 1.1V common-mode voltage. I want to remove the bias and amplify it rail-to-rail. Pretty common task in itself. The obvious choice is to use differential configuration, which gives me 1.05K:28K, 16K:430K etc. combinations.
Now, in ideal world I would get something like precision voltage divider from Vishay and have 1 component on PCB in addition to op-amp itself. In reality, however, only industrial designers can afford $20,000 for 1K of these. What hobbyists usually end up with is an awful mess of resistors in series or trimmers taking up over PCB space.
This got me thinking about alternatives. Technically, I can take only one line of signal source and feed it to non-inverting amplifier with bias (to remove common-node). This should be less sensitive to resistor values giving me more choices for less money. And will not require trimmers.
Q1: Does this make sense?
Q2: Would the precision loss due to using non-differential signal be at least slightly alleviated by lesser sensitivity to resistor matching?
Q3: Or maybe somebody can suggest affordable source of voltage dividers or 0.1-0.05% resistors not in bulk amounts? Note, that while cheap 0.1% resistors are not that hard to find, for some reason they often sold with E24 decade values, which kinda defeats the purpose.