The amplifier is a device that is being used in almost every electronic device we have at home. They are used to enhance the efficiency of a system by keeping certain parameters in control. The parameters include voltage, current, and power. The efficiency of an amplifier is calculated through gain.
In this guide, you will learn about power amplifiers, their block diagrams, efficiency, and working principles. Keep reading to learn more.
In this article
Power Amplifier Block Diagram
It becomes easier to understand a model when we observe it through visuals. Block diagrams are the tools to describe a model by breaking it down into separate blocks and drawing relationships between them.
Here is the block diagram for a power amplifier.
What is a Power Amplifier?
A power amplifier is used to enhance the credibility of a weak signal to a strong one by keeping the other parameters like frequency and wavelength unchanged. It produces a steady amplitude of the signal and helps the circuit to produce productive results. The process of amplifying the weak signal is called amplification.
A Power amplifier is mostly used in audio devices like speakers, TV, and Mobile phone speakers. Many other power amplifiers work differently for other devices and circuits. The amplification process isn't as simple as it looks. There are certain factors and blocks involved in this process.
How Does a Power Amplifier Work?
The measurements of amplification in a power amplifier are calculated based on Gain. The ratio of the output signal to the input signal defines how much gain is attained through the amplifier.
There are three certain ways to calculate Gain in the circuit.
- Voltage Gain
- Current Gain
- Power Gain
The Gain is denoted by A and has no units. Let's calculate each gain now.
Voltage Gain A(v)
The ratio of output voltage to input voltage is called Voltage gain and is represented by the mathematical equation as follows.
Voltage Gain A(v) = Output Voltage/Input Voltage
Current Gain A(i)
Current Gain is the ratio of Output Current to Input Current and is represented by the mathematical equation as follows.
Current Gain A(i) = Output Current/Input Current
Power Gain A(p)
Power gain is the multiplication of Current gain and voltage gain. Power gain is also calculated by Output gain obtained at the output divided by the input gain at the input and represented as given.
A(p)= A(i) * A(v)
Efficiency
The efficiency of the amplifier is calculated by the equation given below.
Efficiency= Output Power /Input Power * 100
For example, we have an output power of 60 W and applied a power of 80 W at the input. The Efficiency of the system would be 48 %.
Efficiency= 60 *80 /100= 48 %
Types of Power Amplifiers
Describe all types of Power Amplifiers you can find; you can provide a block diagram for each if you want
There are many power amplifiers used in electronic circuits, but here are a few of the most used power amplifiers listed below.
- Audio Frequency Power Amplifiers
- Radio Frequency Power Amplifiers
- DC Power Amplifiers
Let's discuss each Power amplifier now
Audio frequency power amplifier
This power amplifier uses a weak signal from the audio devices and makes it stronger for the speakers. In other words, it amplifies the microphone's low-volume audio to a speaker or loud volume. These amplifiers are used in many circuits. We mostly observe the enhanced audio of a movie in a cinema through this amplifier.
The quality of voice and music is increased and helps avoid distortion and noise in the sound. The selection of a specific amplifier has its requirements for better results that might include the impedance, frequency response, distortion, and output devices.
Radiofrequency power amplifiers
The Rf power amplifier is used for long-distance transmissions. The technology used in cell phone devices, internet connection, and radar systems depends on such amplifiers.
The Rf amplifier's efficiency depends on many factors, including power output, the frequency of the signals, output devices, and distortion. It is compulsory to take note of all the factors for better performance of these amplifiers. The prices for such amplifiers are quite high.
DC power amplifiers
Just like any other amplifier, a DC power amplifier is used to enhance the weak DC signal to a Stronger signal at the output. The DC power amplifiers are mostly used in military operations, radar systems, and electric motors.
The DC signal at the input stage is boosted through the amplifier, which employs vacuum tubes or transistors. These signals are then readily available at the output stage to give the best outcome.
How to Make such a Block Diagram on EdrawMax?
Block diagrams serve the purpose of detailed information about a system. These diagrams are made to break down complex systems into simplified forms. These diagrams are easier to make, and if you use the right tools, it will take only minutes to complete them.
EdrawMax helps you make block diagrams for Power Amplifiers. You can create more than 210 types of diagrams with the help of EdrawMax with ease. There are templates available that make your work easier.
Let’s check out how to create a power amplifier block diagram with the help of EdrawMax.
Step 1
Open EdrawMax and click Block Diagram to create a power amplifier block diagram.
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Step 2
There are different elements given on the right side of the screen that you need to drag on the canvas to start with. Drag the blocks from there and arrange them accordingly.
Step 3
Label each block of the diagram to make it more understandable for you and the reader. Keep the fonts bold to have clarity.
Step 4
Draw relationship lines between the blocks and give them proper direction so that it is easier to understand the flow of your block diagram.
Step 5
Change the background and apply colors to the blocks and text to make it more visible.
Your block diagram for the power amplifier is ready. That's how easy it is to make a diagram with the help of EdrawMax.
Conclusion
Power Amplifiers are very crucial parts of an electronic device. They are used to strengthen the weaker signal and provide maximum output at the end. Block diagrams for such amplifiers serve a great purpose and help developers understand a model.
With EdrawMax, it is quite easy to generate quality designs. It provides templates, tools, and great designs for you to use. So, try it and make your designs stand out.
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