What is the variation of dynamic resistance of diode with circuit current and temperature?
Concept: The dynamic resistance can be defined from the I-V characteristic of a diode in forward bias. It is defined as the ratio of a small change to voltage to a small change in current, i.e. ∴ The dynamic resistance of the diode is directly proportional to the temperature.
What is Zener dynamic resistance?
A zener has an internal resistance, think of is as a series resistor inside the diode. Its a dynamic resistance – it changes with current, temperature etc. Power – Remember your zener will heat up by the amount of power it is dissipating, just like say a linear voltage regulator!
What is the dynamic resistance of a p-n junction diode?
Dynamic resistance or AC resistance The dynamic resistance is the resistance offered by the p-n junction diode when AC voltage is applied. When forward biased voltage is applied to a diode that is connected to AC circuit, an AC or alternating current flows though the diode.
Which is the Reverse Resistance of a diode?
Dynamic resistance is also defined as the ratio of change in voltage to the change in current. It is denoted as rf. Reverse resistance is the resistance offered by the p-n junction diode when it is reverse biased. When reverse biased voltage is applied to the p-n junction diode, the width of depletion region increases.
What is the reverse recovery time for a PN junction diode?
The reverse recovery time value for PN junction diode is usually of the order of microseconds. Its value for a widely used small signal diode rectifier 1N4148 is usually 4 ns and for general purpose rectifier diode it is 2 μs. The fast switching speeds can be achieved by the high value of reverse leakage currents and high forward voltage drops.
What is the static resistance of a germanium diode?
The resistivity of the semiconductor increases with temperature. An ideal germanium diode at room temperature has a static resistance of 4. 5 7 Ω at a point, where the current flowing is 4 3. 8 m A. Find the dynamic resistance for a forward bias of 0. 1 volt. Which of the following is true for diode resistance.