申論題

理想值 （一）的答案
A_i = V_out/V_in = (1+ R₂/R₁) = 10(V/V)

實際值
V₊ = V_in
V_- = V_out [R₁/(R₁+ R₂)]
V_out = A_t(V₊-V_-)
A_t = A_t/[1+A_tR₁/(R₁+ R₂)] = A_t/(1+0.1A_t)

誤差公式＝｜實際值-理想值｜/ 理想值
|A_t-A_i| ≤ 0.1%A_i
10- A_t/(1+0.1A_t) ≤ 0.01
9.99(1+0.1A_t) ≤ A_t
9.99 ≤ 0.001A_t
A_t ≥ 9990(V/V)