Draw a Block Diagram for an Operational Amplifier

In this article, we are going to learn some unique ways to draw block diagrams for an op-amp. We will discuss their working processes through block diagrams and learn more about their advantages in a circuit.


In most of the electronic signals, there is a need to modify the signal through some amplifiers. There could be many factors disturbing the signals in a circuit. Noise is one of the main reasons causing the signal to be weak. For such a signal, an amplifier is used to enhance the credibility of the signal and make it more effective for further operations. An Operational Amplifier is used in these scenarios.

What is an Op-Amp? What are the properties and components of an Op-Amp? How does it work? What could be the possible applications? All these questions need answers.

In this article, we are going to explain working through a block diagram for an op-amp. We are going to discuss how these diagrams are made. Let's give it a read!

In this article
  1. What is an OP AMP?
  2. Components of an Operational Amplifier/a>
  3. How To Draw a Block Diagram with EdrawMax?
  4. Conclusion

Part 1. What is an OP AMP?

A weak electric signal is modified through an Op Amp. Op Amplifier is an integrated circuit having two inputs called Inverting and Non-inverting Inputs. A single output at the end of the op-amp provides a clear signal for us to use further in a circuit.

Operational amplifiers are not used alone in any circuit. They are used in circuits to have a specific, clear signal based on the inputs provided by changing the voltage differences between the two inputs. It works just like we see in mobile phone technology, where a weak signal, i.e. a person's voice, is enhanced and converted into a clear voice at the receiver's end. There are many other circuits where we use an op amplifier to keep the electric signal and work it through to make it stronger for further use.

Block Diagram for an Op Amp

Block diagrams are the visual representations of a model or a system. They are used to see insights and processes happening in a system. A block diagram for an operational Amplifier is the best representation of the system, making it more valuable and understandable. Here is the block diagram for an op-amp.

block diagram for an op-amp

The diagram above is the simplest representation of an Op-amp. The block diagram shows two inputs and an output. Here is another diagram that best describes working on an op-amp.

how an op-amp converts the weak signal to a strong one

This diagram tells us about an op-amp and how beneficial it is to use. The signal at the input is irregular and converted into a more regular shape at the output. Three types of amplifiers work inside an operational amplifier, making it worth using.

The inputs, inverting and non-inverting, are connected to the differential amplifier. This deferential amplifier is further connected to the voltage amplifier, which helps the signal to be stronger and passes the signal to the output amplifier.

The positive and negative power supplies are connected to these amplifiers to create either positive or negative output gain. The gain values in both cases are different. You need to take care of the gain when these power supplies are connected.

The output signal is always dependent on the signal applied at the inputs. There could be three modes while applying input signals to these inputs. It can even be applied to both inputs, or either one could be grounded. The output signal will always change when we change the input signal type.

Part 2. Components of an Operational Amplifier

The inputs of the Operational amplifier are usually connected to the base of the transistor. The other components of the Op-amp are resistors, diodes, and capacitors.

The high-impedance inputs are of two types, inverting and non-inverting, having negative and positive signs, respectively. The impedance for the output is always low.

Operational amplifiers can be classified into four types.

  1. Current Amplifiers: The inputs receive current and produce a current output in these amplifiers.
  2. Voltage Amplifiers: These amplifiers receive voltages at the input and produce voltage at the output.
  3. Transconductance: These amplifiers convert voltage inputs to current output.
  4. Trans resistance: These amplifiers convert current inputs to voltage output.

The input signals have to pass through different stages in the amplifier, where these signals are modified and changed according to the needs. The power supply has a crucial role in getting the output. The positive and negative terminals are attached to get the signals in whatever shape is required.

Part 3. How To Draw a Block Diagram with EdrawMax?

There are two methods to draw such a block diagram, which we have drawn above. Here, we will discuss these methods.

Method 1: Start From Scratch

We can draw our block diagram for an op-amp through the blank canvas and take elements given in the EdrawMax. You need to be good at designing to work through this method. If you know the basics, it shouldn't be a problem for you.

Step 1: Open EdrawMax if you have it on your PC. Click New and select a blank template or block diagram wherever you see it. If you can't find it, use the search bar option to get it.

Open edrawmax and start with a new file

Step 2: Drag all the important components you need to make your block diagram from the left-hand side of the canvas.

Look for the symbols bar at the left-hand side of the edrawmax

Step 3: Rearrange those elements on the canvas to make your diagram.

drag all the components needed to drag your diagram

Step 4: Label all the parts and connect them according to the needs of the diagram.

Label the components and add colours to make them visually attractive

After following these steps, you can save the file, and you are ready to go.

Method 2: Start with a Template

Choosing a template rather than designing everything one by one can get tedious sometimes. However, if you want to make your work easy, go for the template. It will have all the materials needed to make your block diagram. Here are the few steps you need to take to make your beautiful block diagram within minutes.

Step 1: Click to download this template and open it in EdrawMax.

start with a template

Step 2: Remove all the unnecessary components in the diagram and the texts if you find nothing useful.

Keep the elements you need to make your diagram

Step 3: Arrange your remaining components and label them correctly. Add relationships in the right direction as well.

Add colours and label each component in the diagram

Step 4: Save the file or export it to your computer.

export the file for further use

So, it is a relatively easier process, and anybody having less experience in designing could get help with it.


So, here is our guide on how you can create a block diagram for an op-amp. In this guide, we have discussed what is an op amplifier and how we can draw a block diagram for it. The block diagram is the best way to understand a model or a system. It gives us a good insight into the structure and workings of that system. It brings value to the software engineers or developers to recheck the model when any changes in the system are needed.

Edrawmax is the way forward to make such an amazing block diagram for many other models as well. It provides unique templates that make our model look good and save a lot of time for us. So, picking up a template could be a good choice for designing a block diagram. Just give it a try!

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Edraw Team
Edraw Team Apr 03, 24
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