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Bipolar Junction Transistors (BJT)
A common-emitter (C-E) is so called because the emitter is connected to both the input and output signals.
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Bipolar Junction Transistors (BJT)
In this analog amplifier the input is in phase with the output.
A decrease in base current of a C-E amplifier causes the voltage measured between the emitter and the collector to increase.
A bipolar transistor has three leads: the base, collector, and emitter.
Transistors are controlled to operate as a switch or to operate as a variable resistor.
In a common-base (C-B) amplifier, the output is 180 degrees out of phase with the input.
In a BJT, the collector current is approximately equal to the base current.
If this circuit were used in a digital circuit, it would be a NOT gate.
With a common-collector (C-C) amplifier the input is applied to the base and the output is taken from the emitter.
A transistor used in a digital circuit will have two operating states, which are cutoff and saturation.
BJTs are "junction" transistors because they use current-carrying P-N junctions.
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