voltage (positive) than that indicated by its letter designation (NPN). The voltage on the
collector must also be more positive than the base (see Figure 2-6).
Figure 2-5. NPN Transistor (Forward Bias)
Figure 2-6. NPN Transistor (Reverse Bias)
2-15. We now have a properly biased NPN transistor. Remember, the base of the NPN
transistor must be positive with respect to the emitter and the collector must be more
positive than the base.
2-16. NPN FORWARD-BIASED JUNCTION - An important point to bring out at this
time is the fact that the N-type material on one side of the forward-biased junction is more
heavily doped than the P-type material. This results in more current being carried across
the junction by the majority carrier electrons from the N-type material than the majority
carrier holes from the P-type material. Therefore, conduction through the forward-biased
23 June 2005