Contents
What is BJT and explain the construction of BJT?
BJT is a semiconductor device that is constructed with 3 doped semiconductor Regions i.e. Base, Collector & Emitter separated by 2 p-n Junctions. Bipolar transistors are manufactured in two types, PNP and NPN, and are available as separate components, usually in large quantities.
How a BJT transistor is constructed?
The BJT is constructed with three doped semiconductor regions separated by two pn junctions, as shown in the epitaxial planar structure in Figure (a). The three regions are called emitter, base, and collector. Physical representations of the two types of BJTs are shown in Figure (b) and (c).
What is working principle of BJT?
Working Principle of BJT The BE junction is forward bias and the CB is a reverse bias junction. The width of the depletion region of the CB junction is higher than the BE junction. The forward bias at the BE junction decreases the barrier potential and produces electrons to flow from the emitter to the base.
What is the difference between BJT and NPN Transister?
An NPN transistor has a layer of P-doped semiconductor between two N-doped layers (Courtesy of Wikibooks) Cutoff: BJT operates in this zone in switching operations. In cutoff, the transistor is inactive. Active: BJT operates in this zone for amplifier circuits because the transistor can act as a fairly linear amplifier.
What are advantages of a BJT amplifier?
They have a better voltage gain
How is MOSFET different from BJT?
Difference between BJT and MOSFET. The BJT is a bipolar junction transistor whereas MOSFET is a metal oxide semiconductor field effect transistor. A BJT has three terminals namely base, emitter and collector, while a MOSFET has three terminals namely source, drain and gate.
What are transfer characteristics of a BJT?
The BJT Transfer Characteristic This ratio is the CURRENT GAIN of the transistor and is given the symbol h fe. A fairly low gain transistor might have a current gain of 20 to 50 , while a high gain type may have a gain of 300 to 800 or more.