Input Characteristics

There are many different types of amplifier circuits, and each one has its own unique benefits and drawbacks. In this article, we will be discussing the common base amplifier circuit. This is a very popular configuration, due to its simplicity and versatility. We will also take a look at the common-collector amplifier circuit, which is another common type of amplifier. By understanding the input characteristics of these two configurations, you can choose the right one for your specific application!

What are Input Characteristics in Transistors?

Input characteristics of a transistor are the set of curves that represent the collector current (Ic) as a function of collector-emitter voltage (Vce) for different values of base current (Ib). The input characteristic curves are plotted with Ib as the independent variable and Vce as the dependent variable. These curves provide information about the transistor’s behaviour in the active region.

Types of Common Input Characteristics

There are three common input characteristic curves:

– Common Base (CB) Configuration:  The CB configuration is the most common type of amplifier. In this configuration, the input signal is applied to the base of the transistor and the output signal is taken from the collector.

– Common Collector (CC) Configuration: The CC configuration is also a common type of amplifier. In this configuration, the input signal is applied to the collector of the transistor and the output signal is taken from the base.

– Common Emitter (CE) Configuration: The CE configuration is the most common type of amplifier. In this configuration, the input signal is applied to the emitter of the transistor and the output signal is taken from the collector.

Each of these configurations has its own set of advantages and disadvantages. The most important thing to remember is that the choice of configuration depends on the specific application.

Common Base Configuration

The CB configuration is the most common type of amplifier because it has a number of advantages.

Advantages of Common Base Configuration:

-The voltage gain of a CB amplifier is high, typically between 20 and 200.

-Since the input impedance is high, this type of amplifier does not load the previous stage.

-The CB amplifier is relatively insensitive to changes in transistor parameters.

Disadvantages of Common Base Configuration:

-The major disadvantage of the CB amplifier is that it has a low input impedance.

-This means that it must be used with a transformer or some other impedance-matching device.

-The CB amplifier also has a relatively low power gain.

What is a Common Base Amplifier?

The common base amplifier is the simplest form of transistor amplifier and is used in a wide range of applications. It has a number of advantages, chief among them being its high input impedance and low output impedance. These characteristics make it ideal for use as an amplifier in a wide range of applications.

The common base amplifier is so named because the transistor’s base terminal is common to both the input and output circuits. The input circuit is typically a resistor or a capacitor, while the output circuit is typically a load resistor. The transistor’s collector terminal is connected to the positive voltage supply, and the transistor’s emitter terminal is connected to the negative voltage supply.

The common base amplifier has a number of advantages over other types of a transistor amplifier. One advantage is its high input impedance. This means that the common base amplifier can be used to amplify very small signals. Another advantage is its low output impedance. This means that the common base amplifier can be used to drive a load resistance without significant loss of power.

One disadvantage of the common base amplifier is its low gain. This means that it is not suitable for applications where a high degree of amplification is required.

What is a Common Collector Amplifier?

The common-collector amplifier is one of the three basic single-stage transistor amplifier topologies. The other two are the common-base and common-emitter amplifiers. All three configurations are used to create voltage or current gain in an amplifier circuit, and all three are widely used in transistor amplifier circuits. The common-collector amplifier is often called an emitter-follower amplifier because the output voltage of the transistor follows, or is a faithful reproduction, of the input voltage.  The voltage gain of a common-collector amplifier is very close to unity, or one.

Conclusion

The common base amplifier is the most widely used of the three basic amplifier configurations. Its main advantage is its high input impedance, which allows it to be used with a variety of input devices. The common-collector amplifier is less popular but has the advantage of being able to handle higher voltages. The common-emitter amplifier is the least popular but has the advantage of being able to handle higher currents. All three amplifier configurations have their own strengths and weaknesses, and it is up to the engineer to choose the right configuration for the job at hand. This article deals with the basics input characteristics, its types, advantages and disadvantages.