How many electrodes are there in a transistor?
There are typically three electrical leads in a transistor, called the emitter, the collector, and the base—or, in modern switching applications, the source, the drain, and the gate.
What are the three layers of transistor?
A transistor has three layers of semiconductors – an emitter, a collector and a base, and it controls the electric conductivity across it to perform a desired task (Ch. 11, p. 208).
Which part of transistor is heavily doped?
emitter
Is the highest current in any bipolar transistor?
The common emitter amplifier configuration produces the highest current and power gain of all the three bipolar transistor configurations.
Why base is lightly doped in transistor?
The base region in a transistor is doped lightly so that the number density of majority carriers (electrons in p-n and holes in n-p-n transistor) is low. When emitter is forward biased, the majority carriers move from emitter to collector through base.
Which transistor configuration is used as voltage amplifier?
The common-base configuration is frequently used as a current buffer or a voltage amplifier. The circuit input is fed to the emitter terminal and the collector is the output. Because the base connects to ground, it is common to input and output.
Is the region of transistor which has highest conductivity?
The base has the highest conductivity because it receives the power and gives it to the collector. If it conductivity is low, it resistivity will be high and there will be enough power loss before reaching the emitter.
When transistor is used as an amplifier it increases?
The transistor raises the strength of a weak signal and hence acts an amplifier. The transistor amplifier circuit is shown in the figure below. The transistor has three terminals namely emitter, base and collector.
Why cascode amplifier is used?
The cascode amplifier, with its variations, is a key element in the circuit designer’s tool kit of useful circuits. It has advantages for increasing bandwidth and for high-voltage amplifier applications. A cascode amplifier has a high gain, moderately high input impedance, a high output impedance, and a high bandwidth.