What is the transistor action?
We use the transistors in the electric circuits to either switch or amplify the signals. Also, it is used to provide power to the circuit. A transistor is made up of two PN diodes linked consecutively. There are three terminals available in a transistor called collector, base, and emitter.
What is the function of transistor PDF?
Transistors amplify current, for example they can be used to amplify the small output current from a logic IC so that it can operate a lamp, relay or other high current device. In many circuits a resistor is used to convert the changing current to a changing voltage, so the transistor is being used to amplify voltage.
What is the significance of VBE and ICO?
Where αI is the inverted current gain of common base transistor with roles of collector and emitter interchanged, VBE is the base to Emitter voltage, Ico is the reverse saturation current of base Emitter junction.
Why VCC is greater than VBB in transistor?
The collector has to collect all the majority carriers injected from the emitter so collector voltage(VCC)- that creates Pull force- must be high. This is the reason why the VCC is always higher than VBB.
What is the importance of transistor action?
Importance of transistor action A transistor transfers the input signal current from a low-resistance circuit to a high-resistance circuit. This is the key factor responsible for the amplifying capability of the transistor.
What are the main functions of a transistor?
A transistor is a kind of solid semiconductor device, which has many functions, such as detecting, rectifying, amplifying, switching, voltage stabilizing, signal modulating and so on. As a variable current switch, the transistor can control the output current based on the input voltage.
What does a transistor do and why is it important?
Transistors make excellent electronic switches. They can turn currents on and off billions of times per second. Digital computers use transistors as a basic mechanism for storing and moving data.
Why does Icbo differ from ICO?
Icbo is the collector current with the base negative. This relates to the cut-off leakage when operating the transistor as a switch. Ico is generally the current at maximum Hfe/beta. The gain of any bipolar is not constant but has a maximum peak.
What is the leakage current in transistor?
In bipolar junction transistors, the emitter current is the sum of the collector and base currents. The collector current has two components: minority carriers and majority carriers. The minority current is called the leakage current.
How do you know if a transistor is saturated?
A transistor goes into saturation when both the base-emitter and base-collector junctions are forward biased, basically. So if the collector voltage drops below the base voltage, and the emitter voltage is below the base voltage, then the transistor is in saturation.
What is Vee in transistor?
–Vee for being the voltage applied to the transistor Emitter leg. If internally built by Field Effect Transistors (FET, MOSFET), the nomenclature is: –Vss for being the voltage applied to the transistor Source pin. –Vdd for being the voltage applied to the Drain of the transistors.
What is the basic construction of a transistor?
The Bipolar Transistor basic construction consists of two PN-junctions producing three connecting terminals with each terminal being given a name to identify it from the other two. These three terminals are known and labelled as the Emitter (E), the Base (B) and the Collector (C) respectively.
What is BJT (bipolar junction transistor)?
A bipolar junction transistor (BJT) consists of three di\erently doped re- gions. These can have the con\\fguration of npnor pnpand the various layers can either be parallel or perpendicular to the surface.
What is the difference between transistor and pnjunction?
Another feature of the transistor is the ability to amplify a signal between one pair of terminals by using an input signal at another pair of terminals. Thus, a transistor can also act as an ampli\\fer. A pnjunction, on the other hand acts as a recti\\fer i.e. conducts in only one direction.
What is the beta value of an an NPN transistor?
An NPN Transistor has a DC current gain, (Beta) value of 200. Calculate the base current Ib required to switch a resistive load of 4mA. Therefore, β = 200, Ic = 4mA and Ib = 20µA.