what is the relation between alpha and beta in transistor?
147908
The alpha factor (α) of a transistor is the ratio of its collector and emitter currents (α = Ic/Ie), and it is always less than 1 (between 0.5 and 1). The beta (β) or current gain is the ratio of its collector and base currents (β = Ic/Ib), and it is always more than 1.
715899
5.2 The Bipolar Transistor - Principle of operation. A bipolar junction transistor consists of two back-to-back p-n junctions, which share a thin common region with width, wB. Contacts are made to all three regions, the two outer regions called the emitter and collector and the middle region called the base.
1250680
BJTS and FETs can be used as switches and amplifiers in electrical and electronics circuits. The major difference between BJT and FET is that, in a field effect transistor only majority charge carries flows, whereas in BJT both majority and minority charge carriers flows.
613469
['Measuring the resistance between B1 and B2 terminals. ... ', 'Reverse biasing the emitter junction. ... ', 'Forward biasing the emitter junction.']
678731
One of the major difference between the NPN and PNP transistor is that in the NPN transistor the current flow between collector to emitter when the positive supply is given to the base, whereas in PNP transistor the charge carrier flows from the emitter to collector when negative supply is given to the base.
613232
Under normal operating conditions, the JFET gate is always negatively biased relative to the source. It is essential that the Gate voltage is never positive since if it is all the channel current will flow to the Gate and not to the Source, the result is damage to the JFET.
713242
Like the BJT, the JFET is a three-terminal device. The terminals are called the source, drain, and gate. They are similar in function to the emitter, collector, and base, respectively.
408256
The main difference between the two types of transistors is that holes are the more important carriers for PNP transistors, whereas electrons are the important carriers for NPN transistors. Then, PNP transistors use a small base current and a negative base voltage to control a much larger emitter-collector current.
1002814
A BJT is a negative temperature coefficient, so current shaving resistors are necessary during parallel operation of BJT's. In MOSFET secondary breakdown does not occur because it have positive temperature coefficient. But BJT exhibits negative temperature coefficient which results in secondary breakdown.
25787
Another difference - A normal switch has only two positions although it may produce electrical bounce when switching from one state to the other. A transistor is perfectly capable of being at any position in between the two endpoint states, ie. it can function as something other than a switch.
1009680
Key Takeaways Alpha is the excess return on an investment relative to the return on a benchmark index. Beta is the measure of relative volatility. Alpha and beta are both risk ratios that calculate, compare, and predict returns.
375007
Bipolar junction transistors are bipolar devices, in this transistor there is a flow of both majority & minority charge carriers. Field effect transistors are unipolar devices, in this transistor there are only the majority charge carriers flows. Bipolar junction transistors are current controlled.
195777
If the transistor is biased into the linear region, it will operate as an amplifier or other linear circuit, if biased alternately in the saturation and cut-off regions, then it is being used as a switch, allowing current to flow or not to flow in other parts of the circuit.
1357345
Both JFET and MOSFET are voltage-controlled transistors used to amplify weak signals both analog and digital. Both are unipolar devices but with different composition. While JFET stands for Junction Field-Effect Transistor, MOSFET is short for Metal Oxide Semiconductor Field Effect Transistor.
368418
Bipolar junction transistors are solid state, three-pin (base, collector and emitter) components, constructed from three layers of silicon. There are two main types of transistor, namely PNP (positive-negative-positive) and NPN (negative-positive-negative).
558301
As their name implies, Bipolar Transistors are “Bipolar” devices because they operate with both types of charge carriers, Holes and Electrons. The Field Effect Transistor on the other hand is a “Unipolar” device that depends only on the conduction of electrons (N-channel) or holes (P-channel).
405232
The main difference between the JFET and a BJT device is that when the JFET junction is reverse-biased the Gate current is practically zero, whereas the Base current of the BJT is always some value greater than zero.