What are the characteristics of NPN transistor?
Generally the NPN transistor is the most used type of bipolar transistors because the mobility of electrons is higher than the mobility of holes. The NPN transistor has three terminals – emitter, base and collector. The NPN transistor is mostly used for amplifying and switching the signals.
What is input characteristics of NPN transistor in common emitter mode?
Solution: In a Common Emitter configuration of a Junction Transistor, the emitter is the common terminal. Input is between the base and emitter. The output is between the collector and emitter. Input characteristics are the variation of base current (IB) with the base-emitter voltage (VBE).
What are the characteristics of transistors?
Common Base (CB) Configuration of Transistor
| Transistor Characteristics | Definition | Formula/Expression |
|---|---|---|
| Current Transfer Characteristics | The variation of collector current(IC) with the emitter current(IE), keeping Collector Base voltage(VCB) constant. The resulting current gain has a value less than 1. | α=ΔICΔIB|VCB=Constant |
What is the function of NPN transistor?
The NPN transistor is designed to pass electrons from the emitter to the collector (so conventional current flows from collector to emitter). The emitter “emits” electrons into the base, which controls the number of electrons the emitter emits.
What are the differences between NPN and PNP transistors?
An NPN transistor has a piece of P-type silicon (the base) sandwiched between two pieces of N-type (the collector and emitter). In a PNP transistor, the type of the layers are reversed. NPN and PNP transistors have very similar schematic symbols. The only difference is the direction of the arrow on the emitter.
Which statement is true for NPN transistor?
Which of the following is true for a npn transistor in the saturation region? Explanation: The commonly used npn transistors have a potential difference of around 0.5V between he collector and the base. Explanation: The value of Vcb is -0.5V for a pnp transistor and 0.5V for an npn transistor.
How many characteristics does a transistor have?
Transistor Characteristics is the basis that represents the relationship between the electric current and electric voltage of a circuit. Basically there are three types of transistor characteristic-curves based on the configuration of the circuit.
What is a transistor describe the characteristics of transistors also write the purpose of transistors?
A transistor is a semiconductor device used to amplify or switch electrical signals and power. The transistor is one of the basic building blocks of modern electronics. It is composed of semiconductor material, usually with at least three terminals for connection to an electronic circuit.
What is the function of PNP and NPN transistor?
when the input is positive, the NPN transistor conducts and drives the output toward +V. When the input is negative, the PNP transistor conducts, driving the output toward -V.
Why are NPN transistors more commonly used than PNP transistors?
As the electrons have higher or faster mobility than holes, the conductivity also more. For this reason, NPN transistors are more preferable than PNP transistors because the NPN transistor provides more conductivity. We know that in electronic circuits all the negative(-ve) or common terminals are grounded.
Which is true for a typical active region of an NPN transistor?
4. Which of the following is true for the active region of an npn transistor? Explanation: The base current and the collector current are directly proportional to each other and the potential difference between the collector and the base is always less than 0.4 V.
What are the output characteristics of NPN transistor?
Output Characteristics of NPN Transistor The family of output characteristics curves of a bipolar transistor is given below. The curves show the relationship between the collector current (IC) and the collector-emitter voltage (VCE) with the varying of base current (IB).
Why is the collector voltage of a bipolar NPN transistor positive?
Also the Collector supply voltage is positive with respect to the Emitter ( V CE ). So for a bipolar NPN transistor to conduct the Collector is always more positive with respect to both the Base and the Emitter.
How to calculate the collector current for common emitter NPN transistor?
From the above equation the collector current for common emitter NPN transistor is given as I C = (V CC-V CE)/R L In a common emitter NPN transistor the relation between collector current and emitter current is given as I C = β I
What are the properties of a bipolar junction transistor?
One of the most important properties of the Bipolar Junction Transistor is that a small base current can control a much larger collector current. Consider the following example. A bipolar NPN transistor has a DC current gain, ( Beta) value of 200. Calculate the base current Ib required to switch a resistive load of 4mA.