Alan Bullard
Definitions
 Semi-Conductor: is a device that has the resistance of
an insulator and the conduction of a conductor. Most
...
Definitions (continued)
 Recombination: excess electronics fall back into their
perspective orbits and limit current flow.
Diode Schematic Diagram
 The diode is comprised of
an “Anode-positive” side
and the “Cathode-
negative” side.
 Conventio...
Diode Block Diagram
 The junction barrier (JB) is
where recombination
occurs and very little
current carriers.
 P-Type: ...
Diode Biasing
 Biasing is in reference to
the power supply and the
diode material.
 When you have the
positive terminal
...
Junction Barrier
 This diode is reversed
biased. As can be seen
the junction barrier is
much larger and current
flow has ...
Junction Barrier
 Here the diode is
Forward biased and as
can be seen the junction
barrier is almost gone.
In this state ...
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Pn junction diodes (presentation)

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Training on PN Junction diodes.

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Pn junction diodes (presentation)

  1. 1. Alan Bullard
  2. 2. Definitions  Semi-Conductor: is a device that has the resistance of an insulator and the conduction of a conductor. Most devices are made up of Silicon or Germanium.  Doping: the process of adding impurities to the device to increase the number of free current carriers.  Current carriers: Majority carriers are the predominate carriers in the semi-conductor material. If it is N-Type material (Arsenic) it is electrons and negative. If it is P-Type material (Aluminum) then it is holes and positive.
  3. 3. Definitions (continued)  Recombination: excess electronics fall back into their perspective orbits and limit current flow.
  4. 4. Diode Schematic Diagram  The diode is comprised of an “Anode-positive” side and the “Cathode- negative” side.  Conventional current flow is from negative to positive.  An easy way to remember is Cathode sounds like “K”, which is the shape of the Cathode.
  5. 5. Diode Block Diagram  The junction barrier (JB) is where recombination occurs and very little current carriers.  P-Type: doped with Aluminum producing excessive holes and is positive.  N-Type: doped with Arsenic producing excessive electrons and is negative.
  6. 6. Diode Biasing  Biasing is in reference to the power supply and the diode material.  When you have the positive terminal connected to the P-Type material and the negative terminal connected to the N-Type material it is forward biases. + -
  7. 7. Junction Barrier  This diode is reversed biased. As can be seen the junction barrier is much larger and current flow has stopped.
  8. 8. Junction Barrier  Here the diode is Forward biased and as can be seen the junction barrier is almost gone. In this state current flow is at its maximum.

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