申論題

1. A commonly used circuit for sensitive resistance measurements is Wheatstone bridge. An amplification circuit (Fig. 1) is needed to amplify the voltage difference generated in Wheatstone bridge. Assume all operational amplifiers are ideal, and answer the following questions:

(c) (5%) Using superposition, derive the relation of Vou and V₂-V₁ as a function of R₁, R₂, Rrand Rg.