What is active region in electronics?
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sometimes called the linear region. It refers to that part of the collector curves that is approximately horizontal. A transistor operates in the active region when it is used as an amplifier. In the active region, the emitter diode is forward-biased, the collector diode is reverse-biased, the collector current almost equals the emitter current, and the base current is much smaller than either the emitter or collector current.
Other electronic terms somewhat related to active region
active current gain switching regulator