What is Knee voltage?

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Pinch OFF voltage
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It is the minimum voltage at which the device would conducts in forward bias mode.For example its about 0.3(volts) for Ge diodes.At this voltage there is a sharp rise in its current value( due to exponential action).
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The minimum voltage required for the device to start functioning. Also known as cut- off voltage or pinch off voltage.
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Quicker Maths

It is the minimum voltage at which the device would conducts in forward bias mode. generally 0.7 v for Si diode and 0.3 v for Ge diode.
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