Chapter 3

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Diode load line
  • Forward bias occurs when the P-type semiconductor material is connected to the positive terminal of a battery and the N-type semiconductor material is connected to the negative terminal, as shown below. This usually makes the p–n junction conduct. <ref> Wikipedia P-N junction</ref>
  • Will the current always flow from the anode to the cathode when the diode is forward biased?
  • Because diodes are a nonlinear device, traditional circuit analysis will not work on them. One method of analyze the diodes is to do it graphically. This technique is called Load-line analysis.
  • Load-line is only used for dc analysis?
  • In circuits with multiple diodes, it is not immediately apparent which diodes are on or off. The ideal-diode model assumes that the diode is a perfect conductor with zero voltage drop in the forward direction and an open circuit in the reverse direction.
  • Is there a better, less exhaustive method to determine which diodes are on or off? With the current system, for n diodes there are possibilities.
  1. Assume a set of states for the diodes
  2. Solve the circuit to find for diodes assumed to be on and for diodes assumed to be off
  3. Check to see if is positive for all diodes assumed to be on and if is negative for all diodes assumed to be off.
  • Explain peak inverse voltage, PIV.
  • Full-wave rectifier circuits: Center-tapped transformer & diode bridge. What are the pros and cons to each?
  • Diode clipper circuits and their zener diode equivalents

Clamp Circuit

  • The large capacitor acts as a DC offset and has a very small impedance for the AC signal
  • Diodes are then used to define the upper and lower limit by conducting if the voltage goes outside their specified range.
  • Why aren't the waveforms clipping in F3.20 (P149)


  • Continue at 3.8


To Do

  • Start up Chapter 3 problems
  • Extend the bag of tricks post. Have subsections for op amps and diodes now. Then BJTs later.

References

<references/>