why in a transistor the base is thin?why the reverse bias voltage is kept higher?

Answer 1

While the other answers are correct, the reason we build transistors is to amplify electrical signals. The base is the active region of the bipolar transistor. The thinner the base, the stronger the E-C electric field, and the larger the impact of a small current injected into the base.

For a given transistor, the ratio of the collector current to the base current is beta, the DC transistor gain. You want just enough steady-state collector current to get good, stable amplification of your input signal. With less reverse bias, you still get the same amplification, but you need to provide more current to operate the same transistor. Today's circuits work hard to minimize power consumption to reduce heat and maximize battery life.

Answer 2

Base Of Transistor

Answer 3

The base is thin because it acts like a barrier and the reverse voltage is kept high to keep the necessary acceleration of electrons to cause amplification in signal

Answer 4

transisitor is a semiconductor active device which is mainly used as an amplifier apart from its use as a switch. it consists of three semiconductor regions as :
emitter- its main function is to emit the majority charge carriers which are present in large quantities and r responsible for carrying out conduction process.
base: it is physically very thin as its major function is to let major quantities of charge carriers to pass through it to collector. it is a different semiconductor material as compared to the remaining two regions i.e emitter and the collector. therefore there are high chances of recombinations between electron and the holes ,which are majority charge carriers in case of p and n type of semiconductor materials . so inorder to reduce these recombinations
base is made very thin .
collector: remains of same material as that of emitter. has comparatively bigger physical size than any of the regions in the transistor. functions as the collector of the majority charge carriers emitted by the emitter.
the reverse bias voltage is kept higher as to attract more and more charge carriers from the emitter region .

Answer 5

In simple words - base is thin to prevent e- from recombining with the +ve holes.
reverse bias voltage is kept higher to prevent the flow of e- in opposite direction and to make sure that most of e- flow into the
collector.

Answer 6

The base is thin because otherwise carriers will recombine before they cross it from the emitter and reach the collector.

Answer 7

Transisitor is an outdated technology and don't bother too much about it. It's all about high power microprocessors and they don't know what to do with it.

There are millions of transisitors inside an Intel processor but they don't want any more expertise on transisitors. They are working on quantum processors.

Answer 8

When you stated "base" I am immediately going to suspect you mean a BJT.

http://en.wikipedia.org/wiki/Bipolar_junction_transistor

Answer 9

Pickup any book on basic semiconductors and read the chapter. Don't be lazy.

Answer 10

You raise some good points in your question.