How Does Cascading Common Emitter Transistors Affect Signal Amplification?

The output of common emitter transistor 1 is connected to the input of common emitter transistor 2. The input and output signals (ac) are usually in uA and miliA respectively. Is there any amplification after transistor 1?John D: Normally, the input is in uA and the output is in miliA.Bob S: Is there any amplification after transistor 2?John D: The output from transistor 1 is in miliA, how should it respond by transistor 2?Out of the conversation, it can be concluded that the thumbnail shows a 2-transistor common emitter (differential) amplifier followed by an emitter follower. The first transistor (Q1) is a common-collector
  • #1
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The ouput of common emitter transistor 1 is connected to input of common emitter transistor 2.
Please explain about the input and ouput signal (ac).
1.Is there any amplification after the transistor 1?
Normally the input is in uA, the output is in miliA
2.Is there any amplification after the transistor 2?
The output from transistor 1 is in miliA, how should it responsed by the transistor 2?
 
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  • #2
In the thumbnail, a 2-transistor common emitter (differential) amplifier is followed by an emitter follower (Q3). The first transistor (Q1) is a common-collector (emitter follower) current amplifier, and the second transistor (Q2) is a common-base voltage amplifier. A 10-mV input signal gives a 150 mV pulse out. Is this what you mean?

Bob S
 

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FAQ: How Does Cascading Common Emitter Transistors Affect Signal Amplification?

1. What is a 2 CE transistor connection?

A 2 CE transistor connection refers to a type of connection used in transistor circuits, where the base of the transistor is connected to both the collector and emitter terminals. This configuration is commonly used in amplifiers and inverters.

2. How does a 2 CE transistor connection work?

In this connection, the base-emitter junction is forward biased, while the base-collector junction is reverse biased. This allows for a small input current to control a larger output current, making it useful for signal amplification.

3. What are the advantages of a 2 CE transistor connection?

One advantage is that it provides high voltage gain, as the collector current is controlled by the base current. It also allows for high input impedance and low output impedance, making it useful for impedance matching.

4. What are the limitations of a 2 CE transistor connection?

One limitation is that it has a high output resistance, which can lead to signal distortion. It also has a low output current, making it unsuitable for high-power applications.

5. How is a 2 CE transistor connection different from other transistor connections?

A 2 CE connection is different from other connections, such as 2 CB (common base) or 2 CC (common collector), in terms of the input and output characteristics. In a 2 CE connection, the input is taken between the base and emitter, while the output is taken between the collector and emitter.

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