Why the base of transistor is kept small?

Base region of a transistor is kept very small and very lightly doped so as to pass most of the injected charge carriers to the collector.

Which transistor current is smallest?

The base current is the largest, the emitter current is the smallest, and the collector and base currents are close.

Why is the base of a transistor?

The base of transistor is lightly doped. A transistor is an electronic component that is used in circuits to either amplify or switch electrical signals or power, allowing it to be used in a wide array of electronic devices. Base – This segment is at the center of the transistor.

Why is base important in transistor?

The base provides proper interaction between the emitter and collector. The flow of majority charge carriers from emitter to the collector is controlled by the base of a transistor. This reduces the rate of electron hole recombination, necessary for a transistor action.

Why is the base current in a BJT is so much less than the collector current?

The base current in the BJT is due to the recombination of holes and electrons. If we take it the other way round, the larger the base current the greater is the recombination, so the collector current should reduce, but Beta Ic/Ib.

How small are today’s transistors?

Modern silicon commercial transistors may be smaller than 45 nanometers in size. They’re so small that NVDIA’s new graphics card (codenamed GF100) has more than 3 billion transistors, the most ever jammed into one chip.

Why are small transistors better?

Since smaller transistors are more power-efficient, they can do more calculations without getting too hot, which is usually the limiting factor for CPU performance. It also allows for smaller die sizes, which reduces costs and can increase density at the same sizes, and this means more cores per chip.

Why the base is lightly doped in BJT or in transistor?

Collector region of a transistor is highly doped so collector region has more width than other two. Hope you understand clearly why the base is lightly doped in bjt or in the transistor. For good amplification process, we required less base current and more collector current So we try to reduce base current by less doping of base region.

What is the difference between small base current and collector current?

Small is relative term, current gain of the transistor decides how small base current would be than collector current. Most of the emitter current of electrons diffuses through the thin base into the collector. Moreover, modulating the small base current produces a larger change in collector current.

What is emitter current in transistor?

Answer: Think transistor as a switch, between emitter and collector, base as a switch key. As per transistor operation, we know emitter current is the total of collector current and base current. Conductivity is increase with an increase in doping.

What is the function of transistor in circuit?

The transistor is an amplifier device. It amplifies current. So we want a small current in to make a larger current out. THe base current is amplified by the amplification factor of the transistor and the circuit. The collector to emitter current is the amplified current.