![]() ![]() The current gain of the common emitter (CE) circuit is denoted with beta (β).It is the relationship between collector current and base current.The following formula is used to calculate the beta (β). The following table below shows the configurations of common emitter, common base and common collector transistors. In this kind of circuit, the emitter terminal is mutual to both i/p & o/p. The following diagram shows the configuration of CE transistor. This gives a good performance and it is frequently thought of as the most commonly used configurations. The gain of the both voltage and current can be defined as a medium, but the o/p is opposite to the i/p that is 1800 change in the phase. The circuit of CE transistor gives a medium i/p and o/p impedance levels. The common emitter transistor configuration is most widely used configuration. If we want to use the same transistor in a CC, we can calculate gamma by the following equation.Ĭommon Emitter Transistor Configuration (CE) Therefore, a variation in base current of this transistor will give a change in collector current that will be nine times as big. These relations are given below.įor instance, the current gain value of the common base value (α) is 0.90, then the beta value can be calculated as When the transistor is connected in any of three basic configurations such as CE, CB and CC then there is a relationship between alpha, beta and gamma. This gain is related to CB current gain that is beta (β), and gain of the CC circuit is calculated when the b value is given by the following formula The current gain of the CC circuit is denoted with (γ) and it is calculated by using the following formula. Common Collector Transistor Configuration The collector terminal is mutual to both i/p and o/p circuits. The following diagram shows the configuration of CC transistor. Offering a high i/p impedance & a low o/p impedance are commonly used as a buffer.The voltage gain of this transistor is unity, the current gain is high and the o/p signals are in phase. The common collector transistor configuration is also known as the emitter follower because the emitter voltage of this transistor follows the base terminal of the transistor. The following formula is used to calculate the current gain of the CE (α) when the CB value is given i.e (β).Ĭommon Collector Transistor Configuration (CC) The gain of the common base configuration is always less than 1. This current is always less than the emitter current which causes it. When the emitter current flows into the base terminal and doesn’t perform as collector current. The current gain of the CB current is less than 1. Alpha is calculated using the formula:įor instance, if the i/p current (IE) in a common base current change from 2mA to 4mA and the o/p current (IC) changes from 2mA to 3.8 mA, the gain of the current will be 0.90 It is the relationship between collector current and emitter current.The current gain is calculated by using the following formula.Īlpha is the relationship of collector current (output current) to emitter current (input current). ![]() The current gain of the CB circuit is calculated in a method related to that of the CE concept and it is denoted with alpha (α). In this circuit, the base terminal is mutual to both i/p & o/p circuits. The following diagram shows the configuration of CB transistor. The main feature of the B transistor is that the i/p and o/p of the transistor are in phase. When the voltage of the CB transistor is high, the gain of the current and overall gain of the power is also low compared to the other transistor configurations. The common base transistor configuration gives a low i/p while giving a high o/p impedance. Types of Transistor Configurations Common Base Transistor Configuration (CB) ![]()
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