⦁ CE is most widely used because it provides the voltage gain required for most of the day to day applications of preamp and power amps . It also provide the maximum transconductance or voltage gain for a given load. ...
Why is CE mode more preferred than CB and CC?
The CE configuration provides both High Current and Voltage gain unlike other configurations like CC (High current gain but voltage gain less than unity i.e 1) and CB (High voltage gain but current gain less than unity).
What are advantages of CE configuration?
- The common emitter amplifier has a low input impedance and it is an inverting amplifier.
- The output impedance of this amplifier is high.
- This amplifier has the highest power gain when combined with medium voltage and current gain.
- The current gain of the common emitter amplifier is high.
Why the CE amplifier circuit are preferred over CB amplifier circuit?
Hence, we can say that the Common Emitter amplifier circuits are preferred over the Common Base amplifier circuit because they have, larger amplification factor . Hence, option (B) is the correct option.
Why common base configuration is not preferred to be used as amplifier?
The common base amplifier configuration is not used as widely as transistor amplifier configurations. However it does find uses with amplifiers that require low input impedance levels. ... As a result, the voltage gain of a common-base amplifier can be very high .
Why CE is mostly used?
Common emitter (CE) configuration. ... Common emitter transistors are used most widely, because a common emitter transistor amplifier provides high current gain, high voltage gain and high power gain . This type of transistor gives for a small change in input there is small change in output.
Which transistor configuration is the most preferred?
Common emitter transistor configuration
This provides a good overall performance and as such it is often the most widely used configuration. As can be seen from the diagram, in this transistor configuration, the emitter electrode is common to both input and output circuits.
What is CE configuration?
The common emitter (CE) configuration is the most widely used transistor configuration. The common emitter (CE) amplifiers are used when large current gain is needed. The input signal is applied between the base and emitter terminals while the output signal is taken between the collector and emitter terminals.
What is power gain of CE configuration?
Current gain in the common emitter circuit is obtained from the base and the collector circuit currents. Because a very small change in base current produces a large change in collector current, the current gain (β) is always greater than unity for the common-emitter circuit, a typical value is about 50 .
What is β for a CE configuration?
A transistors current gain is given the Greek symbol of Beta, ( β ). As the emitter current for a common emitter configuration is defined as Ie = Ic + Ib, the ratio of Ic/Ie is called Alpha, given the Greek symbol of α. ... Typically, Beta has a value between 20 and 200 for most general purpose transistors.
What is meant by early effect?
The Early effect, named after its discoverer James M. Early, is the variation in the effective width of the base in a bipolar junction transistor (BJT) due to a variation in the applied base-to-collector voltage .
What is the phase relation between input and output?
The phase difference between the input and output voltage of CE amplifier circuit is. The phase difference of 180 0 between the signal voltage and output voltage in a common emitter amplifier is known as phase reversal.
What is current amplification factor?
The current amplification factor or current gain of a transistor is the ratio of output current to the input current . If the transistor is connected on base mode the current gain α=IEIC and if the transistor is connected in common emitter mode, the current gain α=IBIC.
What is the main drawback of a common base amplifier?
In the common base amplifier configuration the input current exceeds all other currents in the circuit , including the output current, the current gain of this amplifier is actually less than 1. In other words, it attenuates current rather than amplifying it. Chapter 6, Problem 26P is solved.
What are the uses of common base configuration?
Applications. This arrangement is not very common in low-frequency discrete circuits, where it is usually employed for amplifiers that require an unusually low input impedance, for example to act as a preamplifier for moving-coil microphones.
Why BJT is called bipolar device?
Simply put, a BJT is a three-terminal semiconductor device. The name “bipolar” comes from the fact that this type of transistor contains two types of semiconductor material—one positive type (p-type) and one negative type (n-type)—through which a current flows . Bipolar junction transistors usually contain silicon.
