Below I have the graph of the voltage of a diode versus its current. As you can see, the forward bias region is when Vd>0 and reverse bias when Vd<0. My question is: In which region does Vd=0 fall in?
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\$\begingroup\$ Would deciding this question change anything at all about the actual behavior of the diode? \$\endgroup\$– The PhotonOct 9, 2019 at 2:27
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\$\begingroup\$ I just need to know whether Vd=0 is forward or reverse bias. \$\endgroup\$– HectorOct 9, 2019 at 2:34
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\$\begingroup\$ Why? How will it change any circuit you design? \$\endgroup\$– The PhotonOct 9, 2019 at 2:38
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\$\begingroup\$ I guess it does not. Another question for you, why is there a slight drop in Vd when Id increases? \$\endgroup\$– HectorOct 9, 2019 at 2:51
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\$\begingroup\$ who says it does? If you use the passive current convention, then \$\frac{dV}{dI}\$ is always positive for an ideal diode. \$\endgroup\$– The PhotonOct 9, 2019 at 2:58
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1 Answer
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Since Null is neither a positive nor negative number (see https://math.stackexchange.com/questions/26705/is-zero-positive-or-negative), Vd=0 is neither forward nor reverse bias.
answered Oct 9, 2019 at 8:04