difine knee voltage of diode
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It the minimum voltage at which diode starts conducting. It's depends up on the type of material is used ti fabricate diode. For silicon it is 0.7v and for germanium 0.3v. below knee voltage current is 0A after this knee voltage current starts flowing.
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At room temperature, a potential difference equal to the barrier potential is required before a reasonable forward current starts flowing across the diode. This voltage is known as threshold voltage or cut-in voltage or knee voltage .
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