# 9 Different Op Amp Circuit Configurations Cheat Sheet

Op Amplifier is an electronic component which is widely employed in different practical applications. The reason for naming it as operational amplifier comes from its history. In early days the amplifiers were used to perform mathematical operations such as addition, subtraction, multiplication, integration, differentiation and other mathematical operations.

### Operational Amplifier Cheat Sheet

In this cheat sheet, the 9 different circuit configurations for opamp and their formulas are provided. The list of configurations provided here are:

#### Operational Amplifier

The simple of the open loop has very high voltage gain. A very high input impedance and a very low output impedance. Learn more about Operation amplifier.

#### Non-inverting configuration

In the non-inverting configuration, the input is directly applied to the +ve terminal. Two resistors are connected to the output terminal from which output is taken. The voltage gain of the non-inverting amplifier is given by 1 + (Rf/Ri)

#### Inverting configuration

The input is applied on the -ve terminal of op-amp via a resistor. The +ve pin is directly grounded. The output voltage appears with a phase shift of 180 degrees. A negative sign is used to indicate the phase shift of inverting amplifier in its gain equation. Mathematically the gain of the amplifier is: -(Rf/Ri).

#### Voltage follower

The output is directly fed to the inverting terminal and input is directly connected to the positive pin. Such condition provides a voltage gain of 1.

#### Summing Amplifier

This configuration is used for adding the input voltages. The +ve pin is directly grounded whereas input signals are fed to the input terminals of the amplifier.

#### Integrator

A capacitor connects between the output terminal and -ve input of the amplifier. This configuration is used to perform the integration of signals.

#### Differentiator

The input is fed to inverting terminal via a capacitor. A resistor connects between the input and output terminals. The circuit is used to perform differentiation of alternating signals.