I wonder if anyone can tell me the meaning of the statement

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Discussion Overview

The discussion revolves around the meaning of the voltage specifications for silicon and germanium diodes, specifically the 0.7V for silicon and 0.3V for germanium. Participants explore whether these values indicate the voltage drop across the diodes when they are forward biased.

Discussion Character

  • Conceptual clarification
  • Technical explanation

Main Points Raised

  • One participant questions the meaning of the voltage specifications for silicon and germanium diodes, asking if they represent the forward bias voltage drop.
  • Another participant confirms that the specified voltages do indicate the forward bias voltage drop, noting typical values for germanium and silicon diodes.
  • A third participant suggests that understanding the concept is easier when considering light-emitting diodes (LEDs) and provides links for further reading.
  • Another participant offers an analogy, stating that the specified voltage is the minimum needed to "turn on the switch," emphasizing the role of the material in determining electrical properties.

Areas of Agreement / Disagreement

Participants generally agree that the specified voltages represent the forward bias voltage drop across the diodes, but there are variations in how this concept is explained and understood.

Contextual Notes

Some participants reference different materials (Si, Ge, GaAs) and their electrical properties, which may imply varying behaviors under certain conditions, but these aspects remain unexplored in depth.

amaresh92
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i wonder if anyone can tell me the meaning of the statement " a 0.7V silicon diode or 0.3V germinium diode"?
is this given voltage(0.7 or 0.3) specify the voltage drop across the diode when it is forward biased?

advanced thanks.
 
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is this given voltage(0.7 or 0.3) specify the voltage drop across the diode when it is forward biased?

Yes. Note that for germanium diodes, the forward bias voltage is said to be around 0.2 to 0.3 volts and for silicon diodes around 0.6 to 0.7 volts.

diod6.gif
 

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Another easy way to look at it is, it's the small amount of voltage needed to turn on the switch. The Si, Ge, GaAs...whatever type, is just the material used during the fabrication process which has different electrical properties.
 

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