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The V-I characteristics of silicon diode...

The V-I characteristics of silicon diode is shown in Fig. Calculate the diode resistance in `` forward bias at `V=+0.9V ` reverse bias `V=-3.0V`.

Text Solution

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In forward characteristic for voltage `V=+0.9V`
`DeltaV=DE=1.0-0.80=0.2V, DeltaI=CE=10-6=4mA`
`:.` Forward resistance, `R_(f)=(DeltaV)/(DeltaI)=(0.2V)/(4mA)=50Omega`
in reverse characteristics for voltage `V=-3V ,DeltaV=-2-(-4)=2V, DeltaI=3-2=1muA`
`:.` Reverse resistance, `R_(r)=(DeltaV)/(DeltaI)=(2V)/(1muA)=2xx10^(6)Omega`
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