Below is video tutorial about a noise of a non-inverting operational amplifier circuit. On this video, we are explained about how to calculate the noise of a non inverting amplifier. What we have to do first is ground all the voltage sources. Because now all voltage sources is grounded, so the noise of non inverting configuration is exactly the same as inverting configuration. What we gonna do now is calculating the resistor noise, current noise of the amplifier, and the voltage noise.

For remember that a smaller resistor has bigger noise than the bigger resistor. For an example, 100 KΩ resistor has 40nV/√Hz and 1 KΩ resistor has 400nV/√Hz. For further information about the calculation, watch the entire video.