Answer to Question #226879 in Electric Circuits for samsam

Question

Operation amplifiers are used in mostly all electronic circuits. State the difference between inverting and non-inverting operation amplifier. Draw the waveform for both the inputs and outputs of each of these amplifiers, and provide a label indicating if it is inverting or non-inverting

Answer 1

Explanations & Calculations

• Basically, op-amps are used for amplifying the input signals.

• The inverting setup of the amplifier of course amplifies the signal that is input to it but at the same time it inverts the polarity of that signal compared to that is input. (if the input is +5mV then the output would be -5mV provided that the voltage gain of the amplifier is just 1:unity)
• Similarly, the non-inverting one keeps the polarity of the output signal exactly the same as the input. (+5mV input signal is amplified to +5k mV provided that the voltage gain is k)

• Note that the signal is input to the non-inverting (+) terminal during the non-inverting mode while to the inverting(-) terminal during the inverting mode.
• Those +/- signs are the standards used in op-amp notations.
• Amplification is governed by the gain of the op-amp which is determined during the circuit design stage.