The knee voltage of a crystal diode is approximately equal to

Concept:

• The forward voltage at which the current through the PN junction starts increasing rapidly is known as knee voltage.
• The Knee voltage of a crystal diode is approximately equal to barrier potential.
• In a silicon diode operating at its rated currents, the voltage drop is about 0.7 volts.
• Schottky diodes can be rated as low as 0.2 V.
• Germanium diodes have cut-in voltage around 0.3 V.
• Red or Blue light-emitting diodes (LEDs) can have values of 1.4 V and 4.0 V respectively.

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