Transistor Amplifiers Assignment Help

Transistor Amplifiers Assignment Help Service

A transistor does the work of an amplifier by intensifying the power of a weak signal. Due to the DC bias voltage which is being applied to the emitter-base junction, it remains in the forward biased situation. While studying this topic in details, students are asked to complete assignments regularly and this is when; they seek the expert writing assistance.

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Performance of an Amplifier

For understanding the performance of an amplifier, you must understand some vital terms referred to this mode of connection and they are:

• Input Resistance – The input resistance is considered the opposition which is proposed by the base-emitter connection to the signal flow.
• Output Resistance – Output resistance is considered the ratio of alteration in collector-emitter voltage to the subsequent alteration in collector current at constant base current.
• Effective Collector Load – The load gets linked at the transistor’s collector and for a single-stage amplifier, the output voltage gets extracted from the transistor’s collector. For a multi-stage amplifier, it is accumulated from dropped stages of transistor circuit.
• Voltage Gain – It is the gain which is derived related to voltage when the alterations in input as well as output currents are witnessed.
• Current gain – It is the gain related to the current when the alterations in input and output currents get observed.
• Power gain – It is the gain related to power when the alterations in input currents and output currents are observed.

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What is Meant by Transistor Amplifier?

An amplifier is recognized as a circuit which is utilized for intensifying a signal. The input signal to the amplifiers will be a voltage or current and the result will be an amplified variety of the input signal. The amplifier circuit which is grounded on a transistor (s) is known as a transistor amplifier.

A transistor amplifier is mostly used in applications, such as radio frequency (RF), optic fiber communication (OFC), audio, etc. The most usual application that is witnessed in daily life is the use of the transistor in the form of an audio amplifier.

The Transistor Configurations

The three chief transistor configurations which are commonly used are CB (common base), CE (common emitter), and CC (common collector). Configuration possesses a gain which is lesser compared to the unit and common collector configuration has a gain which is nearly equal to unit.

CE follower has got a gain which is greater than unity and positive. Hence, common emitter configuration is mostly used in audio amplifier applications. A good transistor amplifier should have the following parameters, like high bandwidth, high input impedance, high linearity, high slew rate, high gain, high stability, high efficiency, etc.

• Operation of CE (common emitter) amplifier

When a signal gets applied through the emitter-base junction, then the forward bias through this junction intensifies at the time of the upper half cycle and it results in an increase in the flow of electrons. The increasing collector current turns more voltage drops all across the collector load resistor RC.

• CC (common collector) amplifier

This amplifier is considered one of the three fundamental BJT amplifier topologies. Here, the base of the transistor does the job of an input. The emitter works as the output and the collector is common for both base and emitter, and it is known as an emitter follower.

Features of Common Base Amplifier

Also known as a grounded-base amplifier, common-base amplifier is one of the three common single-stage BJT (bipolar junction transistor) amplifier topologies which are usually utilized in the form of a voltage amplifier or current buffer.

Here, the emitter terminal of the transistor does the job as the input, the output is the collector, and the base gets linked to the ground. The analogous field-effect transistor circuit is considered the common-gate amplifier.

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