1kΩ
+
+
$v_{in}$
-
9kΩ
1kΩ
+
$v_{out}$
-
Figure 3: Circuit for Problem 3.
Problem 3: Application - 15%
Consider the ideal op-amp circuit shown in Figure 3.
a) Write an expression for the relationship between $v_{out}$ and $v_{in}$.
b) What is $v_{out}$ when $v_{in} = 0.2 V$?
c) What function does the circuit perform? What is a real-world application that this
circuit would be useful for?