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A bipolar junction transistor (BJT) is a type of transistor that uses both electrons and electron holes as charge carriers. In contrast, a unipolar transistor, such as a field-effect transistor (FET), uses only one kind of charge carrier.
The band diagram of an NPN BJT in equilibrium: Date: 20 February 2007: Source: Own drawing, done in Inkscape: Author: ... Bipolar junction transistor; Global file usage.
Energy band diagram of a simple NPN w:bipolar junction transistor in forward-active mode showing electron energy versus position. The w:depletion regions of the emitter-base and base-collector junctions are marked.
Energy band diagram of a simple bipolar junction transistor under equilibrium showing electron energy versus position. The depletion regions of the emitter-base and base-collector junctions are marked. <math>E_c</math> is the conduction band
A load line diagram, illustrating an operating point in the transistor's active region.. Biasing is the setting of the DC operating point of an electronic component. For bipolar junction transistors (BJTs), the operating point is defined as the steady-state DC collector-emitter voltage and the collector current with no input signal applied.
Thus the two voltages are subtracted according to Kirchhoff's voltage law (KVL) (the subtractor from the function block diagram is implemented just by the input loop), and their difference V diff = V in − V out is applied to the base–emitter junction. The transistor continuously monitors V diff and adjusts its emitter voltage to equal V in ...
Illustration of load line for a common emitter bipolar junction transistor amplifier. The load line diagram at right is for a resistive load in a common emitter circuit. The load line shows how the collector load resistor (R L) constrains the circuit voltage and current. The diagram also plots the transistor's collector current I C versus ...
Figure 1: Basic NPN common base circuit (neglecting biasing details). In electronics, a common-base (also known as grounded-base) amplifier is one of three basic single-stage bipolar junction transistor (BJT) amplifier topologies, typically used as a current buffer or voltage amplifier.
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