The rest of the electrons move towards the n-side. Here, neutralization of some electron occurs. Then the electron moves towards the p side. The depletion region of this emitter-base area is narrower compared to the depletion area of the collector-base intersection.Īs the junction is reverse biased (emitter), the holes flow from the supply to the N junction. The base emitter junction is set as the reverse bias and the collector base junction works as forward bias. Now, as the n side of a diode has electrons as majority and p side has holes as majority, all the voltage connections get arranged as forward and reverse bias accordingly. The reverse bias is connected between the collector voltage and the collector. The forward bias is established between the Emitter voltage and the emitter. NPN transistor needs both the reverse and forward bias for working. Other than these, NPN transistor has many applications in temperature sensors, circuits like logarithmic converters, etc.If there is a need to sink current, then also NPN transistors could be used.The NPN transistor is used Darlington pair circuits to amplify weak signals to significantly scaling up signal.These are used in amplifier circuits i.e., push-pull amplifier circuits. These are also used in amplifying and switching the signals.Usually, the NPN transistor is used as bipolar transistor because of electrons’ mobility, as it is higher than the mobility of holes.The nearest pin is the emitter, and the rest pin is a collector terminal.
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