Full Answer
What is the relation between α and β of a transistor?
Where ,α represents current gain in common-base-configuration and β represents current gain in common emitter configuration of transistor. Hope this will work. What are α and β transistors? Alpha is the ratio of the collector current to the emitter current.
What is a transistor?
What is a Transistor? A transistor is a type of a semiconductor device that can be used to both conduct and insulate electric current or voltage. A transistor basically acts as a switch and an amplifier.
How many terminals are there in a transistor?
A Transistor has 3 terminals, the emitter, the base and the collector. Using these 3 terminals the transistor can be connected in a circuit with one terminal common to both input and output in a 3 different possible configurations. The three types of configurations are Common Base, Common Emitter and Common Collector configurations.
What are the different types of transistor configuration?
There are three types of configuration as a common base (CB), common collector (CC) and common emitter (CE). In Common Base (CB) configuration the base terminal of the transistor is common between input and output terminals.
What is relation between α and β?
β=1−α
What are α and β for this transistor?
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. Note: that the value of Alpha will always be less than unity.
What is the relation between transistor parameters?
The parameters of the transistor are: Current gain: The current gain of a transistor is the measure of the ability of the transistor's amplification property. It is usually denoted by β. The current gain is the ratio of the base current to the collector current.
What is the relation between Alpha and beta in CE configuration?
α=1+ββ
What is β of a transistor?
The beta (β) of a transistor, or transistor current gain, is the ratio of the transistor's collector current (Ic) to its base current (Ib), as shown in Equation 1. β = Ic/Ib. (1) The β value is fixed for a given transistor and operating condition.
What is the value of alpha of a transistor?
For a transistor the value of alpha is 0.9 .
What is the relation between current gain α and β?
β=1−αα
What are α and β parameters for a transistor obtain a relation between them?
Solution. Alpha (αdc): It is defined as the ratio of collector current to emitter current. Beta (βdc): It is the current gain defined as the ratio of collector current to the base current.
What is Q point in transistor?
The operating point of a device, also known as a bias point, quiescent point or Q-point, is the steady-state DC voltage or current at a specified terminal of an active device such as a transistor with no input signal applied.
What is the relation between alpha and beta Mcq?
Explanation: α and β are related as β=α/(1-α).
What is the correct relation between beta and gamma?
Claim: The gamma and beta functions are related as b(a, b) = Γ(a)Γ(b) Γ(a + b) .
What is the relation between alpha beta and gamma Class 11?
⟹α:β:γ=1:2:3.
What is the relation between current gain α and β?
β=1−αα
How do you find the beta of a transistor?
1:191:43NPN Transistor Structure and Calculating Beta - YouTubeYouTubeStart of suggested clipEnd of suggested clipAn important characteristic of a transistor is something called beta beta is calculated by dividingMoreAn important characteristic of a transistor is something called beta beta is calculated by dividing the collector current IC by the base current IB.
What do you mean by Alpha of the transistor?
Complete step-by-step answer: $\alpha \text{ and }\beta $ are the parameters for a transistor which defines the current gain in a transistor. $\alpha $ is defined as the ratio of the collector current to the emitter current.
What are the alpha beta and gamma parameters of a transistor?
A transistor 's alpha is the current gain defined as the ratio of change in collector current to change in emitter current in the common base configuration, while beta is the current gain in the \[{\text{CE}}\] configuration. It is defined as a change in the current of the collector to the current of the base.
Detailed Solution
The common-emitter current gain (β) is the ratio of the transistor's collector current to the transistor's base current, i.e.
More Bipolar Junction Transistor Questions
Q1. Which of the following logic circuits offers high speed operation?
More Electronic Devices Questions
Q1. Which of the following logic circuits offers high speed operation?
How do Transistors work?
Let us look at the working of transistors. We know that BJT consists of three terminals (Emitter, Base and Collector). It is a current-driven device where two P-N junctions exist within a BJT.
What are the parts of a transistor?
Parts of a Transistor 1 Base: This is used to activate the transistor. 2 Collector: It is the positive lead of the transistor. 3 Emitter: It is the negative lead of the transistor.
What are the three terminals of a BJT?
The three terminals of BJT are base, emitter and collector. A very small current flowing between base and emitter can control a larger flow of current between the collector and emitter terminal. Furthermore, there are two types of BJT. These include; P-N-P Transistor: It is a type of BJT where one n-type material is introduced or placed between two ...
What is the purpose of N-P-N transistor?
N-P-N transistor is basically used to amplify weak signals to strong signals. In NPN transistor, the electrons move from the emitter to collector region resulting in the formation of current in the transistor. This transistor is widely used in the circuit.
What is a transistor made of?
A typical transistor is composed of three layers of semiconductor materials or more specifically terminals which helps to make a connection to an external circuit and carry the current. A voltage or current that is applied to anyone pair of the terminals of a transistor controls the current through the other pair of terminals.
How does V CB give the variation of I C with the I E?
It gives the variation of I C with the I E by keeping V CB as constant.
When electrons and holes meet, what happens?
When they meet each other they will combine enabling a current to flow across the junction. When the junction is reverse biased the holes and electrons move away from the junction, and now the depletion region forms between the two areas and no current will flows through it.
How many terminals does a transistor have?
A Transistor has 3 terminals, the emitter, the base and the collector. Using these 3 terminals the transistor can be connected in a circuit with one terminal common to both input and output in a 3 different possible configurations. The three types of configurations are Common Base, Common Emitter and Common Collector configurations.
Why is common emitter connection used in transistors?
Hence, the current gain in Common Emitter connection is very high. This is the reason this circuit connection is mostly used in all transistor applications.
What is the common terminal for a PNP transistor?
The name itself implies that the Emitter terminal is taken as common terminal for both input and output of the transistor. The common emitter connection for both NPN and PNP transistors is as shown in the following figure.
What happens when the emitter voltage is applied to the NPN transistor?
When the emitter voltage is applied, as it is forward biased, the electrons from the negative terminal repel the emitter electrons and current flows through the emitter and base to the collector to contribute collector current. The collector voltage VCB is kept constant throughout this.
What is the collector terminal?
The name itself implies that the Collector terminal is taken as common terminal for both input and output of the transistor. The common collector connection for both NPN and PNP transistors is as shown in the following figure.
What is the input current in a CB?
In the CB configuration, the input current is the emitter current IE and the output current is the collector current IC.
Can collector voltage VCB affect collector current IC?
Collector Voltage VCB can affect the collector current IC only at low voltages, when V EB is kept constant.
What is a transistor?
Transistor is a semiconductor device capable of transferring the signal from high resistance to low resistance or vice versa. Transistor has three terminals and is used in electronic circuits as amplifiers and switches. There are mainly three types of transistors used in electronic circuits they are a) bipolar junction transistor b) ...
How does reverse bias affect transistors?
As you increase collector to base voltage that is if you more reverse bias base collector junction the depletion layer width increases as depletion layer width is proportional to reverse bias voltage. This depletion layer protrudes more in to the base than collector because base is lightly doped compared to collector. As we increase base to collector voltage depletion layer width increases this in turn decreases effective base width. According to law of junction injected carrier concentration in base should reduce to zero at the onset of depletion layer in base. In the graph (plotted with minority carrier concentration on Y-axis and distance from emitter base junction to base collector junction on x-axis stands) shown below the left side is plotted for higher reverse bias compared to graph on right side with less slope compared to the one on the right .This is termed as Early effect.
What is the purpose of biasing circuits?
The main aim of biasing circuits is to stabilise the transistor’s operating point irrespective of variations in Ico, β, Vbe which vary because of varying temperature. Mainly the variation of Ico with temperature is a significant one and has to be taken care of. Accordingly a stability factor is defined o quantify the stability of biasing circuits with respect to variation in transistor parameters.
What are the three terminals of a bipolar transistor?
BJT has three terminals a) Emitter b) base c) collector analogous to cathode gate and anode in vacuum tube. Emitter is heavily doped collector is moderately doped and base is lightly doped as we need most of the current from emitter should reach collector; base current is needed only as a pilot signal for collector current variation. Transistor is active device which has the ability to control the electron flow through it. BJT is of two types 1) PNP transistor 2) NPN transistor .PNP transistor is formed by sandwiching n-type semiconductor between two P-type semiconductors. Similarly PNP transistor is formed by sandwiching n-type semiconductor between two P type semiconductors.
What is bipolar junction transistor?
Bipolar junction transistor internal design is in such a way that it will have high gain in normal active mode. Also when you interchange the roles of emitter and collector with emitter base junction reverse biased then break down voltage decreases as break down voltage is inversely proportional to the amount of doping.
What are the three configurations of a BJT?
BJT can be operated in three configurations with one terminal common to both input and output. They are a) Common Base b) Common emitter c) Common collector configurations.
What is the Ebers Moll model of transistors?
Ebers-moll model of transistor holds for all regions of operation of BJT. This model is based on assumption that base spreading resistance can be neglected.
What is relation between beta and gamma?
the relation between beta and gamma function states that the beta function of two variable ? (m,n) is equal to the gamma function of 'm' and 'n' divided by addition of two variable. Hence, the formula of relation between beta and gamma function is ? (m,n) = (?m ?n) ∕ ?m + ?n.
Which of the following correctly determines the relation between alpha and beta?
Which of the following correctly determines the relation between α and β? Explanation: α and β are related as β=α/ (1-α).
What is alpha and beta?
Beta is a measure of volatility relative to a benchmark, such as the S&P 500. Alpha is the excess return on an investment after adjusting for market-related volatility and random fluctuations. Alpha and beta are both measures used to compare and predict returns.
What is the formula of alpha into beta?
If α and β are roots of a Quadratic Equation ax 2 + bx + c = 0 then, α + β = -b/a.
What is the difference between alpha and beta release?
A beta test is carried out following acceptance testing at the supplier's site (alpha test) and immediately before the general release of the software as a product. In general an alpha version or release of a software package intends to do something particular, mostly does so, yet isn't guaranteed to do so fully.
What comes first alpha or beta?
Alpha and beta testing are two of the stages that a software must undergo testing. Alpha testing occurs first and when the software passes that, beta testing can then be undertaken.
What is alpha and beta in common emitter 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. Note: that the value of Alpha will always be less than unity.