- Simple AC coupled common emitter amplifier design
- Common-Emitter Configuration of a Transistor
- Common Emitter Amplifier Configuration
- What is a Common Emitter Amplifier?
- Common Emitter Amplifier (CE) Circuit Working and Applications
- Working of Common Emitter Amplifier
- Common emitter
- Common Emitter Amplifier
There are different types of transistor amplifiers operated by using an AC signal input. Which are interchanged between the positive value and negative value, hence this is the one way of presenting the common emitter amplifier circuit to function between two peak values.
This process is known as the biasing amplifier and it is an important amplifier design to establish the exact operating point of a transistor amplifier which is ready to receive the signals hence it can reduce any distortion to the output signal.
Simple AC coupled common emitter amplifier design
The common emitter amplifier is a three basic single stage bipolar junction transistor and is used as a voltage amplifier. The input of this amplifier is taken from the base terminal, the output is collected from the collector terminal and the emitter terminal is common for both the terminals.
The basic symbol of the common emitter amplifier is shown below. The below circuit diagram shows the working of the common emitter amplifier circuit and it consists of voltage divider biasing, used to supply the base bias voltage as per the necessity.
The voltage divider biasing has a potential divider with two resistors are connected in a way that the midpoint is used for supplying base bias voltage.
Common-Emitter Configuration of a Transistor
There are different types of electronic components in the common emitter amplifier which are R1 resistor is used for the forward bias, the R2 resistor is used for the development of bias, the RL resistor is used at the output it is called as the load resistance.
The RE resistor is used for the thermal stability.
Common Emitter Amplifier Configuration
The C1 capacitor is used to separate the AC signals from the DC biasing voltage and the capacitor is known as the coupling capacitor. The alternating current is applied to the base of the transistor of the common emitter amplifier circuit then there is a flow of small base current.
Hence there is a large amount of current flow through the collector with the help of the RC resistance. The voltage near the resistance RC will change because the value is very high and the values are from the 4 to 10kohm. Hence there is a huge amount of current present in the collector circuit which amplified from the weak signal, therefore common emitter transistor work as an amplifier circuit.
The current gain of common emitter amplifier is defined as the ratio of change in collector current to the change in base current.
The voltage gain is defined as the product of the current gain and the ratio of the output resistance of the collector to the input resistance of the base circuits.
The following equations show the mathematical expression of the voltage gain and the current gain.
What is a Common Emitter Amplifier?
The following circuit diagram shows the common emitter transistor amplifier. This transistor amplifier has a common configuration and it is a standard format of transistor circuit whereas voltage gain is desired. The common emitter amplifier is also converted as an inverting amplifier. The different types of configurations in transistor amplifiers are common base and the common collector transistor and the figure are shown in the following circuits.
The characteristics graph between the bias and the gain is shown below.
Common Emitter Amplifier (CE) Circuit Working and Applications
This article discusses the working of the common emitter amplifier circuit. By reading the above information you have got an idea about this concept. Here is the question for you, what is the function of the common emitter amplifier? I read this article. Hy Tarun, nice article.
Working of Common Emitter Amplifier
I thoroughly enjoyed the way you delivered it. I am trying to design a voltage divider. What I want is, to check the impact of loading on the divider for common emitter amplifier. The calculator which I am using is at Now for checking the loaded output voltage and the current flowing towards the load I need to enter load RL.
What should I do in the case of the common emitter? I actually want to ask the resistance of this amp,. For the common emitter amplifier circuit, the input is applied to the base, and the output is taken from the collector. The common terminal for both circuits is the emitter.
The reason for this can be seen from the fact that as the input voltage rises, so the current increases through the base circuit. In turn this increases the current thought the collector circuit, i. This results in the voltage between the collector and emitter terminals falling. In this way an increase in voltage between the base and emitter has resulted in a fall in voltage between the collector and emitter terminals, in other words the phase of the two signals has been inverted.
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Common Emitter Amplifier
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