What is base width modulation BWM effect?
Base width modulation is also known as Early effect is a phenomenon that occurs in transistor biased in active region(emitter -base forward bias & collector -base reverse bias) .
What is meant by base with modulation?
[′bās ‚mäj·ə′lā·shən] (electronics) Amplitude modulation produced by applying the modulating voltage to the base of a transistor amplifier.
What is base width in BJT?
Modern BJTs have base widths of about 0.1 µm.
When base width becomes zero the effect is called?
3. As we increase further the reverse bias voltage at some point effective base width approaches zero and transistor will breakdown . This phenomenon is called reach through or punch through.
What is transistor and why it is called like that?
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. Transistors have very high input resistance and very low output resistance.
What is base spreading resistance in transistor?
AN important physical parameter of a junction transistor is the ‘base. spreading resistance’, which acts as a feedback network for the flow of. minority carrier current from emitter to collector. It is an important. parameter since the limitations of high frequency are dependent on it and.
How can base width modulation be reduced?
To reduce the base-width modulation effect, we need to have most of the base-collector depletion width occurring on the collector side of the junction. In order to do that, we need NDC < NAB. In a typical BJT, the “doping rank” is: NDE > NAB > NDC.
Why is base made thin?
The base region in a transistor is made very thin so that there is a better conduction of majority carriers from emitter to collector through base. Due to it, the base current is quite weak, the collector current is nealy equal to the emitter current.
What is base width modulation Early effect in transistor Mcq?
The phenomenon known as ‘Early effect’ in a bipolar transistor refers to a reduction of the effective base-width caused by. Electron-hole recombination at the base. The reverse-biasing of the base-collector junction. The forward-biasing of the emitter-base junction.
What is base width?
Base width is a measurement of how wide your breast is from side to side and from top to bottom.
What is the need for modulation?
Need For Modulation in Communications System. Modulation is a signal-processing operation that is basic to the transmission of an information-bearing signal over a communication channel, whether in the context of digital or analog communications.
What is depth of modulation?
The modulation index (or modulation depth) of a modulation scheme describes by how much the modulated variable of the carrier signal varies around its unmodulated level. It is defined differently in each modulation scheme.
What is baseband modulation?
Modulation. The aim of digital baseband modulation methods, also known as line coding, is to transfer a digital bit stream over a baseband channel, typically a non-filtered copper wire such as a serial bus or a wired local area network .
What is significance of modulation index?
significance of modulation index. It is used to determine the strength and quality of transmitted signal. If the modulation index is small, then the amount of variation in the carrier amplitude is small. Thus, the audio signal transmitted willnot be strong.