Transistor is an electronic device made of three layers of semiconductor material that can act as an insulator and a conductor. The three layered transistor is also known as the bipolar junction transistor. Transistor Definition. Page 7.
What is a transistor in physics?
A transistor is a miniature semiconductor that regulates or controls current or voltage flow in addition amplifying and generating these electrical signals and acting as a switch/gate for them. Typically, transistors consist of three layers, or terminals, of a semiconductor material, each of which can carry a current.
What are the 3 function of transistors?
transistor, semiconductor device for amplifying, controlling, and generating electrical signals.
What is transistor formula?
Transistor Formulas For the NPN transistor, the emitter current is the total of base and collector current. IE = IC + IB. For the PNP transistor, the collector current is the difference between emitter current and base current. IC = IE – IB.
What is unit of transistor?
What is the unit of the transistor? The standard units of a transistor for electrical measurement are Ampere (A), Volt (V), and Ohm (Ω) respectively.
What is the principle of transistor?
Well, the very basic working principle of a transistor is based on controlling the flow of current through one channel by varying intensity of a very smaller current that is flowing through a second channel. Also Read: Transistor as a Switch. Transistor as Amplifier.
What is transistor and its types?
A transistor is a semiconductor device used to amplify or switch electronic signals. Transistors are broadly divided into three types: bipolar transistors (bipolar junction transistors: BJTs), field-effect transistors (FETs), and insulated-gate bipolar transistors (IGBTs).
What is meant by Q Point?
Q point or the operating point of a device, also known as a bias point, or quiescent point is the steady-state DC voltage or current at a specified terminal of an active device such as a diode or transistor with no input signal applied.
What are the two basic types of transistors?
Transistors typically fall into two main types depending on their construction. These two types are bipolar junction transistors (BJT) and Field Effect Transistors (FET).
What is a transistor symbol?
Transistor Symbols The symbol of NPN and PNP is shown in the figure below. The arrow in the symbol indicates the direction of flow of conventional current in the emitter with forward biasing applied to the emitter-base junction. The only difference between the NPN and PNP transistor is in the direction of the current.
What are the 2 main functions of a transistor?
A transistor is a semiconductor device, usually made out of silicon or germanium, used to amplify or attenuate the strength of the electric current in electronic circuits. Transistors have two basic functions: to amplify electric current or to block its passage.
Why is transistor important?
Transistors transformed the world of electronics and had a huge impact on computer design. Transistors made of semiconductors replaced tubes in the construction of computers. By replacing bulky and unreliable vacuum tubes with transistors, computers could now perform the same functions, using less power and space.
What is NPN vs PNP?
As they are normally referred, PNP and NPN sensors are both supplied with positive and negative power leads, then produce a signal to indicate an “on” state. PNP sensors produce a positive output to your industrial controls input, while NPN sensors produce a negative signal during an “on” state.
Where is NPN transistor used?
NPN transistors are used in applications where a current sink is required. Some classic amplifier circuits, such as ‘push-pull’ amplifier circuits, make use of this component. In temperature sensors, for example. Applications with extremely high frequency.
What is base current?
Base current is typically 1% of emitter or collector current for small signal transistors. Most of the emitter electrons diffuse right through the thin base (c) into the base-collector depletion region. Note the polarity of the depletion region surrounding the electron at (d).
What are uses of transistor?
Transistors are commonly used in digital circuits as electronic switches which can be either in an “on” or “off” state, both for high-power applications such as switched-mode power supplies and for low-power applications such as logic gates.
Why transistor is called transistor?
The word transistor is a combination of transfer and resistance. This is because it transfers the resistance from one end of the device to the other end or we can say, transfer of resistance. Hence, the name transistor.
What is NPN transistor explain?
The NPN transistor is made of semiconductor materials like silicon or germanium. When a p-type semiconductor material is fused between two n-type semiconductor materials, an NPN transistor is formed. The NPN transistor features three terminals: emitter, base and collector.
How transistor is formed?
The Transistor is a three terminal solid state device which is formed by connecting two diodes back to back. Hence it has got two PN junctions. Three terminals are drawn out of the three semiconductor materials present in it. This type of connection offers two types of transistors.
What are the components of a transistor?
Transistors are composed of three parts ‘ a base, a collector, and an emitter. The base is the gate controller device for the larger electrical supply. The collector is the larger electrical supply, and the emitter is the outlet for that supply.
What is BJT and FET?
The Bipolar Junction Transistor (BJT) is an active device. In simple terms, it is a current controlled valve. The base current (IB) controls the collector current (IC). The Field Effect Transistor (FET) is an active device. In simple terms, it is a voltage controlled valve.
How transistors are named?
Bipolar junction transistors are the most commonly used type. To help identify them, transistors are labeled with number and letters on their casings. Transistors are labeled according to the numbering system that is used. The primary numbering systems are JIS, Pro Electron, and JEDEC.
What is Q point formula?
Generally, the Q-point of the amplifier is half-way along the load line so the Collector current will be given as half of 9.2mA. Therefore Q = 4.6mA. This DC load line produces a straight line equation whose slope is given as: -1/(RL + Re) and that it crosses the vertical Ic axis at a point equal to Vcc/(RL + Re).
What is the load line?
“Load line is a special marking positioned amidships which depicts the draft of the vessel and the maximum permitted limit in distinct types of waters to which the ship can be loaded.” When the load line is drawn over the output characteristic curve in a graph, it makes contact at a point known as the operating point/ …
What is AC and DC load line?
If this load line is drawn only when DC biasing is given to the transistor, but no input signal is applied, then such a load line is called as DC load line. Whereas the load line drawn under the conditions when an input signal along with the DC voltages are applied, such a line is called as an AC load line.