Non-Inverting Amplifier

The non-inverting amplifier circuit is relatively a simple circuit. A resistor $R_1$ is placed between the inverting input and the ground. A second resistor $R_2$ is place between the output of the op-amp and the inverting input. The non-inverting input is the input signal you want to amplify. You can find below the schematic for the non-inverting amplifier :

The voltage gain of the non-inverting amplifier can be found with this formula :

$\cfrac{V_{out}}{V_{in}}=G_V=1+\cfrac{R_2}{R_1}$

Do note that if the positive supply or negative supply is not high or low enough, the output voltage will clip at Vs+ or Vs- if the amplify signal exceeds the supply voltage.

The input impedance of the non-inverting amplifier is very close to $Z_{in}=\infty$ . The input impedance is the non-inverting input impedance of the specific op-amp you are using which is generally very high. The output impedance is the output impedance of the op-amp which is generally low.