Chapter 3 problems: Difference between revisions

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V=0. D1, D4 on. Can you really sink current into a voltage source? I don't see how you will ever have negative voltage across the diodes.
V=0. D1, D4 on. Can you really sink current into a voltage source? I don't see how you will ever have negative voltage across the diodes.



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Revision as of 12:19, 1 March 2010

3.9

Part A

  • Using KVL:
  • Thus the two points for the load line are and
  • Overlay the above two points with the diode characteristics to find the answer.

Part B

  • Is there a physical part that mimics the device characteristics of X?
  • Using KCL:
  • Thus: and , however this is off the chart. Is this correct?

Part C

  • Using KCL:
  • I believe there is a problem with my equation.

3.17

Part A

  • Guessing D1 is on, D2 and D3 are off. Looking at the voltage drops, this is very unlikely.
  • Guessing D1 off, D2 on, D3 off. and .
  • Checking for positive current through presumed on diodes and negative voltage across the presumed off diodes.
  • D1 and D2 fail. D3 passes.
  • Guessing D1 and D2 on, D3 off.
  • and . D1, D2, D3 pass.

Check each guess please. More importantly, check the wrong assumptions.

Part B Need help on this one.

  • , : D1, D4 on. D2, D3 off.
  • , : D1, D4 on. D2, D3 off.
  • , : D2, D3 on. D1, D4 off.
  • , : D2, D3 on. D1, D4 off.

V=0. D1, D4 on. Can you really sink current into a voltage source? I don't see how you will ever have negative voltage across the diodes.


3.33

3.37