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saranga
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what happens in the common base type of a transister,if we interchange the input to output and output to input? i suppose that the current gain >1 .so this would use for amplification...
thanks for your guidence!The Electrician said:Using a model for the common base topology: https://en.wikipedia.org/wiki/Common_base
Perform a small signal analysis, but with the collector driven, and calculate how much signal will appear at the emitter.
A common base type of a transistor is a type of configuration where the base terminal of the transistor is connected to the common ground or negative terminal of the power supply. This type of configuration is commonly used in high-frequency applications.
The common base type of a transistor has several advantages, including high current gain, low input capacitance, and high input impedance. These characteristics make it ideal for use in applications such as amplifiers and oscillators.
In a common base type of transistor, the input signal is applied to the emitter terminal, while the output is taken from the collector terminal. The base terminal is connected to the common ground, and the base-emitter junction acts as a diode. This configuration allows for a high input impedance and low output impedance.
The common base type of a transistor is commonly used in radio frequency (RF) circuits, as well as in audio amplifiers and oscillators. It is also used in high-speed switching applications due to its fast response time and high current gain.
The main difference between a common base type of transistor and other configurations, such as common emitter or common collector, is the location of the input and output signals. In a common base type, the input is applied to the emitter, while in a common emitter type, the input is applied to the base. Additionally, the common base type has a higher input impedance compared to the common emitter type, and a lower output impedance compared to the common collector type.