Here is the question:

My solutions:

I finished the first part and received the correct solutions, but I have no idea how to to the second part, where they ask to find a value for resistor R that will cause the gain error to be zero, noting that all the switches have an on-resistance of 200 ohms in this case.

I am not sure what they are relating the gain error to, as the gain is not constant in the previous example. Am I to pick an R that meets specification with an ideal case?

The solution that Jaeger and Blalock (Q12.79 - 4th Edition) posted was

**R = 1.0742 kohms**. No idea how they came to that though.

Can anyone lend a hand?

Thanks!