![]() In this condition, there is, ideally, a short between collector and emitter, as indicated by the switch equivalent. ![]() In part (b), the transistor is in the saturation region because the base-emitter junction and the base-collector junction are forward-biased and the base current is made large enough to cause the collector current to reach its saturation value. In this condition, there is, ideally, an open between collector and emitter, as indicated by the switch equivalent. In part (a), the transistor is in the cutoff region because the base-emitter junction is not forward-biased. The below Figure illustrates the basic operation of a BJT as a switching device. ![]()
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