{{fa>pencil?32}} 1. Derive the voltage gain $A_{\rm V}= {{U_{\rm O}}\over{U_{\rm I}}}$ for the inverting amplifier. \\ Use the procedure that was used for the non-inverting amplifier.\\ * What is looking for? * Number of variables? * Number of necessary equations? * Establishing the known equations * Derivation of the voltage gain Take into account that for the differential gain $A_\rm D$ of the ideal OPV applies: $A_\rm D \rightarrow \infty$. And the following also applies: $1/A_\rm D \rightarrow 0$ \\ **But** the following doesn't always apply: ${{C}\over{U_x \cdot A_\rm D}} \rightarrow 0$, for an unknown constant $C$ and a voltage $U_x$! \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ 2. Which type of amplifier circuit (inverting or non-inverting amplifier) has the lower input resistance? Why?