Capacitors in Common Emitter Amplifier Circuit ?

[AbuYusufEg]

Capacitors in "Common Emitter Amplifier" Circuit ?

Should i use Capacitors in "Common Emitter Amplifier" ( CEA ) Circuit ?

As i saw many CEA circuits designed without any capacitors there !

And also hear that it's better to use two capacitors, one after the Voltage Source ( that feeds the Base ), And another Just before the another Voltage Source ( that feeds the Collector ).

So, What do you think about that ? and why should is (use/don't use) them ?

 

[yungman]

Should i use Capacitors in "Common Emitter Amplifier" ( CEA ) Circuit ?

As i saw many CEA circuits designed without any capacitors there !

And also hear that it's better to use two capacitors, one after the Voltage Source ( that feeds the Base ), And another Just before the another Voltage Source ( that feeds the Collector ).

So, What do you think about that ? and why should is (use/don't use) them ?

It will be better if you can provide a diagram.

Let me guess. You are talking is the AC coupling cap. A transistor need proper biasing before it can work as an amplifier. The bias on the base might not be the same as the voltage source into the base. A cap will filter the DC from the voltage source so it does not affect the transistor biasing.
An AC decoupling cap usually needed to couple the output signal from the collector of the transistor to the second stage amplifier also.

This is my guess of your question without seeing the diagram. Hope that answer your question.

 

[oswaler]

I would say that the use of capacitors in a common emitter amplifier circuit depends on the specific design and purpose of the circuit. Capacitors can serve several functions in a CEA circuit, including coupling, filtering, and bypassing. Coupling capacitors are used to connect two stages of a circuit while blocking DC signals. Filtering capacitors are used to remove unwanted noise or signals from a circuit. Bypass capacitors are used to provide a low impedance path for AC signals while blocking DC signals.

Whether or not to use capacitors in a CEA circuit ultimately depends on the specific requirements and goals of the circuit. Some CEA circuits may not require capacitors, while others may benefit from their use. It is important to carefully consider the design and purpose of the circuit before deciding whether or not to use capacitors.

In general, the use of capacitors in a CEA circuit can improve performance and stability by filtering out unwanted signals and providing a smooth, stable power supply. However, the addition of capacitors can also add complexity and cost to the circuit, so it is important to weigh the potential benefits against the practical considerations.

Ultimately, the decision to use capacitors in a CEA circuit should be based on a thorough understanding of the circuit's requirements and the potential impact of capacitors on its performance. It may be helpful to consult with other experts or conduct simulations or experiments to determine the best approach for a specific circuit.