Transcription of 14. Transistor Characteristics Lab
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14. Transistor Characteristics Lab
14. Transistor Characteristics LabIntroduction Transistors are the active component in various devices like amplifiers and oscillators. They arecalled active devices since transistors are capable of amplifying (or making larger) signals. The proper-ties of transistors will be studied in this module so basically the focus here is understanding how transis-tors work. The next module will focus on basic amplifier design. Transistors can also be used as switchesbut since this is not a course in digital electronics, we will not discuss the function of transistors. Basic Bipolar Transistor Theory The basic Bipolar Transistor or BJT is two diodes constructed back to back on a piece of silicon.
Characteristics As we said, bipolar transistors have three terminals: base, emitter, and collector. Transistors characteristics are graphs of the various currents (Ibis current into the base, Ie is current out of the emitter, and Icis current into collector) and voltages. Conservation of charge yields Ib +Ic = Ie (3)
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