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Date/Time Thumbnail Dimensions User Comment; current: 16:08, 31 August 2012: 720 × 720 (7 KB): Michael9422 {{subst:Upload marker added by en.wp UW}} {{Information |Description = {{en|A simple NPN transistor amplifier circuit diagram with transistor labels.}} |Source = I created a postscript file, and converted it too SVG using the pstoedit program. |Date = ...
Consider an NPN transistor circuit. During the positive half-cycle of the signal, the base is positive with respect to the emitter and hence the base-emitter junction is forward biased. This causes a base current and much larger collector current to flow. The positive half-cycle of the signal is amplified in the collector.
The NPN BJT (n-type bipolar junction transistor) and nMOS (n-type metal oxide semiconductor field effect transistor) have greater conductance than their PNP and pMOS relatives, so may be more commonly used for these outputs. Open outputs using PNP and pMOS transistors will use the opposite internal voltage rail used by NPN and nMOS transistors.
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Wire crossover symbols for circuit diagrams. The CAD symbol for insulated crossing wires is the same as the older, non-CAD symbol for non-insulated crossing wires. To avoid confusion, the wire "jump" (semi-circle) symbol for insulated wires in non-CAD schematics is recommended (as opposed to using the CAD-style symbol for no connection), so as to avoid confusion with the original, older style ...
Band diagram for NPN transistor at equilibrium Band diagram for NPN transistor in active mode, showing injection of electrons from emitter to base, and their overshoot into the collector BJTs can be thought of as two diodes (p–n junctions) sharing a common region that minority carriers can move through.
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