![]() ![]() Figure 3 shows the circuit diagram of a common collector BJT amplifier. In the common collector amplifier, the input signal is applied at the base terminal and the output signal is obtained at the emitter terminal. The BJT amplifier in which the collector terminal of the bipolar junction transistor is common to both input and output circuits is known as a common-collector (CC) amplifier. ![]() It has medium current and voltage gains. ![]() The output impedance of the common emitter amplifier is also medium.The common emitter amplifier has medium input impedance.The following are the important characteristics of a common emitter amplifier: But it introduces a phase difference of 180° between the input and output signals. The common emitter amplifier receives a weak signal at the base terminal and produces an amplified signal at the collector terminal. Figure 2 shows the circuit diagram of a common emitter BJT amplifier. In the common emitter amplifier, the input signal is applied at the base terminal and the output signal is obtained at the collector terminal. Common Emitter (CE) AmplifierĪs the name suggests, a BJT amplifier in which the emitter terminal of a bipolar junction transistor is common to both the input circuit and output circuit is known as a common emitter (CE) amplifier. The common base amplifier has a current gain approximately equal to 1.The output impedance of the common base amplifier is high.The input impedance of the common base amplifier is low.The common base amplifier has high voltage gain.The following are some important characteristics of a common base amplifier: both input and output signals remain in phase with each other. The common-base amplifier does not introduce any phase shift between the input and output, i.e. In this type of BJT amplifier, the input signal is applied at the emitter and the amplified output signal is obtained at the collector terminal. The circuit diagram of a common base amplifier is shown in figure-1. ![]() Common Base (CB) AmplifierĪs the name suggests, the BJT amplifier circuit in which the base terminal is common between both input and output circuits is called a common base (CB) amplifier. Now, we will discuss all these amplifiers one by one to understand their behavior. Types of BJT Amplifiersĭepending upon the configuration of BJT used in the amplifier circuit, they can be of the following three types namely, Depending upon the quantity amplified by the circuit, the BJT amplifier could be a voltage, current, or power amplifier. It increases the strength of the input signal and produces an amplified output. BJT amplifier is basically a bipolar junction transistor operated in the active region. The BJT amplifier plays a vital role in a number of electronic applications. What is BJT Amplifier?Īn electronic circuit that consists of a bipolar junction transistor and performs the amplification of signals is called a BJT amplifier. However, in practical applications, the NPN BJT is most widely used due to its fast-switching speed. Thus, based on the construction, the bipolar junction transistor can be of two types namely, NPN Bipolar Junction Transistor and PNP Bipolar Junction Transistor. A BJT or bipolar junction transistor is a three-terminal two-junction semiconductor device that can operate as a static switch or amplifier depending on the biasing applied to it.Ī bipolar junction transistor is constructed by sandwiching a layer of n-type (or p-type) semiconductor between two p-type (or n-type) semiconductor layers. What is Bipolar Junction Transistor?įirst of all, let us discuss what is bipolar junction transistors or BJT. In this article, we shall discuss an electronic circuit using a bipolar junction transistor (BJT) which operates as an amplifier, i.e. ![]()
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