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Diodes

Diodes. Ping Hsu Buff Furman John Luk 21SEP2010. Diode Types and Circuit Symbols. Diode Types Signal Diodes Rectifier Diodes Light Emitting Diodes Zener Diodes. Symbol:. Anode (P). Cathode (N). Actual Device:. Anode (P). Cathode (N). P-N Junction – Forward Bias. A Diode

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Diodes

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  1. Diodes Ping Hsu Buff Furman John Luk 21SEP2010

  2. Diode Types and Circuit Symbols • Diode Types • Signal Diodes • Rectifier Diodes • Light Emitting Diodes • Zener Diodes Symbol: Anode(P) Cathode(N) Actual Device: Anode(P) Cathode(N)

  3. P-N Junction – Forward Bias A Diode is formed by A junction between positively and negatively doped semiconductor material • P Type • Doped with Boron or Gallium(1 Less e-) • N Type • Doped with Arsenic or Phosphorous(1 Extra e-) Anode(P) Cathode(N) P N Holes e- Net current + -

  4. P-N Junction – Reverse Bias • P Type • Doped with Boron or Gallium(1 Less e-) • N Type • Doped with Arsenic or Phosphorous(1 Extra e-) Anode(P) Cathode(N) P N Holes e- No net current -+

  5. I-V Characteristic for a Diode (non-linear) = 1/R I IV Characteristic for a Resistor Reverse Bias V Breakdown Voltage50-1000V 0.6 to 0.7 V for silicon diode Forward Bias Anode Voltage higher than Cathode

  6. Example 1 • Find VD, IR, VR • VD = -10V, VR = 0, IR = 0 + VD - - 10V + + VR- IR

  7. Example 2 • Find VD, IR, VR , R = 1Ω VD = 0.7V VR = 10 – 0.7 = 9.3V IR = 9.3 / 1 =9.3A + VD - + 10V - + VR- IR

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