In this tutorial I will discuss about the (Op amp inverting non inverting amplifier)inverting amplifier and non inverting amplifier configurations. As we know that the Operational Amplifier can be configured in a variety of ways to perform different tasks and this can be done by its feedback configuration. Two of the most commonly known configurations of the Operational Amplifier are the Inverting Amplifier in which the input signal is shifted by 180 degree at the output and the Non-inverting Amplifier in which the phase angle remains intact at the output and only the amplification is done.
After reading this post you will learn the circuitry for implementing Inverting and Non-inverting Amplifier using the Operational Amplifier, changing the parameters of the feedback network to change the gain of the amplifier, the transfer equations for the Inverting and Non-Inverting Operational Amplifier. So sit back, keep reading and enjoy learning.
Difference Between Inverting and Non Inverting Amplifier
In the previous post I have discussed about the general introduction of the Operational Amplifier, applications of the Operational Amplifier in the diverse field as Electronics. Operational Amplifier can be obtained in a variety of packages with attributes optimized for specific applications this property leads to the classification of the Operational Amplifier in General Purpose Operational Amplifier and Precision Operational Amplifier. I will discuss the specification of each in the coming posts here I will stick just to the Operational Amplifier as Inverting and Non-Inverting Operational Amplifier.
Op amp inverting non inverting amplifier
As discussed in the previous post that Operational Amplifier is the Differential Amplifier that is it amplifies the difference of the signals applied to the Inverting and Non-Inverting terminals of the Operational Amplifier. This quirk of the Operational Amplifier makes it useful to be used in active filter where you need to eliminate the Electromagnetic Interference in the signal line. It is important to note here that the Inverting and Non-Inverting Operational Amplifier configurations are single ended input Amplifiers that is one end of the signal will be connected to one of the terminal and the other end will be grounded along with the other input terminal of the Operational Amplifier. So in the Inverting Operational Amplifier configuration the signal is applied at the inverting terminal of the Operational Amplifier and the Non-inverting input Terminal is grounded and opposite is the case for Non-Inverting Operational Amplifier configuration. One other thing to be considered in this section is that the gain of the Operational Amplifier configuration depends upon the parameters of the feedback configuration.
Inverting Operational Amplifier:
Let us now discuss the Inverting Operational Amplifier configuration in detail. The circuit implementation for the Inverting Amplifier using the Operational Amplifier is shown in the figure below.
As described earlier that the Operational Amplifier is always used in the feedback configuration and this feedback configuration determines the task to be determined by the Operational Amplifier. The feedback configuration for the Inverting Amplifier consists of only the resistors and the resistance of these resistors determines the gain of the Inverting Operational Amplifier configuration. The feedback network of the Inverting Operational Amplifier is basically the voltage divider circuit which feeds the portion of the Output signal to the Input terminal of the Operational Amplifier. You must have noticed in the above discussion that in order to understand the operation and working of the Operational Amplifier circuits it is important to grasp the subtleties of the feedback network used in the circuit of the Operational Amplifier. This simple circuit of the Inverting Operational Amplifier uses the voltage divider utilizing the resistors in the feedback network and it is quite simple in its operation and to understand, the other more complicated circuit configurations of the Operational Amplifier will have more complicated feedback networks and I will discuss each in my upcoming posts.
In order to design the Inverting Operational Amplifier there must be the equation that relates the input signal to the output signal. This type of equation is called the Transfer Equation. The transfer equation for the Inverting Operational Amplifier configuration is shown as follows.
The derivation of this equation is out of the scope of this post but if you want to dive deep into the discussion of the transfer equation you must follow the good book for analog engineers. There are a number of books available online.
Non-Inverting Operational Amplifier:
The basic difference between the Inverting and Non-inverting Operational Amplifier configurations is the output waveform of each. In the Non-Inverting Operational Amplifier the output signal of the circuit is in phase with the input signal and obviously in the Non-Inverting Operational Amplifier configuration the input signal is applied at the Non-Inverting input terminal of the Operational Amplifier. The circuit for the Non-Inverting Operational Amplifier configuration is shown in the picture below:
The feedback configuration of the Non-Inverting Operational Amplifier configuration also consist of the resistors only and it also acts as the voltage divider circuit. The feedback network of the Non-Inverting Operational Amplifier configuration also acts to feed the portion of the Output signal at the input of the Operational Amplifier. The gain of the Non-Inverting Amplifier is determined by the resistance of the resistors utilized in the feedback network. The transfer equation for the Non-Inverting Operational Amplifier configuration is shown as follows:
The derivation of this transfer equation is outside the scope of this post(Op amp inverting non inverting amplifier).
That is all for now I hope this article on the Inverting and Non-Inverting Operational Amplifier will be helpful for you. In the next article I will come up with the more interesting applications of the Operational Amplifier. Till then stay connected, keep reading and enjoy learning.
op amp input bias current and offset current:
Operational Amplifier as Differential Amplifier
Introduction to Operational Amplifier
Characteristics of the Ideal Operational Amplifier
Operational Amplifier as the Instrumentation Amplifier
Op amp inverting non inverting amplifier
