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Homework Help: Characteristics of a transistor

  1. Apr 16, 2008 #1
    i have to submit a report on the characteristics of a transistor.
    there's three zones
    blockage zone
    saturation zone
    and modulation zone

    i understand the first 2
    but the modulation zone i couldn't find out what it is

    please help if you can
  2. jcsd
  3. Apr 16, 2008 #2
    please someone help the guy
    I have the same question
  4. Apr 16, 2008 #3
    On wikipedia they are called "regions of operation"

    The blockage zone is the cutoff region.
    The saturation zone is the saturation region.
    The modulation zone would be the active (or forward-active) region. This is the region where the transistor can be used for amplification. The base-emitter and collector emitter junctions are forward biased, and the collector current is below the saturation current.
  5. Apr 16, 2008 #4
    than you
  6. Apr 16, 2008 #5


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    the modulation zone is the zone that lies between the cutoff zone and saturation zone. in that zone, we like to model the transistor as a "current-controlled current source" and use these "h parameters" to describe it.
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