What is Step Recovery Diode? What is Step Recovery Diode? – It is also a voltage dependent variable capacitor diode but with unusual doping profile. It has concentration of charge carriers decreasing near the junction, as illustrated in Fig. 8.46, and therefore, a phenomenon, called the reverse snap-off is caused. It operates as an ordinary …
Point Contact Diode Construction and Working: The point contact diode is basically constructed by touching a metallic whisker to an exposed surface of an N-type semiconductor substrate. The semiconductor used in the point contact diode may be either of germanium or of silicon. However, germanium is preferred over silicon because of its higher carrier mobility. …
Tunnel Diode Construction and Working: Tunnel Diode Construction and Working – The tunnel diode (sometimes called the Esaki diode after its inventor, Dr. Leo Esaki) is a high conductivity, heavily doped two-terminal P-N junction. This diode differs from the normal P-N junction diode in the amount of impurity concentration. The impurity concentration in a normal …
Zener Diode Application: Zener diodes have numerous applications in transistor circuitry. Some of their common Zener Diode Application are explained below. 1. Zener Diode as a Voltage Regulator: Voltage regulation is a measure of a circuit’s ability to maintain a constant output voltage even when either input voltage or load current varies. Figure 8.9 shows how …
Construction and Working of Zener Diode: Zener diode, also sometimes called the breakdown diode, is a P-N junction diode specially designed for operation in the breakdown region in reverse bias condition. Construction and Working of Zener Diode is like an ordinary P-N junction diode except that it is properly doped so as to have a …
PN Junction Diode Applications: An ideal PN Junction Diode Applications is a two terminal polarity sensitive device that has zero resistance (i.e., diode conducts) when it is forward biased and infinite resistance (i.e., diode does not conduct) when reverse biased. Because of this property the diode finds use in many applications as enumerated below : …
Switching Diode in Electronics: In discussing the rectifier diodes, the importance of reducing the reverse-bias current and the power losses under forward bias to the minimum was emphasized. But in case a junction diode is to be employed for high speed switching applications, special consideration is required to be given to its charge control properties. …
PN Diode Switching Times: A P-N junction diode may be used as an electrical switch. The electrical circuit can be made ‘on’ and ‘off’ by forward biasing or reverse biasing the diode. In both the cases, the diode response is accompanied by transient, and an interval of time elapses before the diode recovers to its …
Equivalent Circuit of a Diode: It is usually advantageous to replace a device or system by its equivalent circuit. An equivalent circuit of a device or a system is a combination of electric elements properly chosen to best represent the actual terminal characteristics of the device or the system. Once the equivalent circuits is determined, …
Transition and Diffusion Capacitance: Transition and Diffusion Capacitance – Electronic devices are inherently sensitive to very high frequencies. Most shunt capacitive effects that can be ignored at lower frequencies due to very high reactance (XC being equal to 1/2πfC) cannot be ignored at very high frequencies. XC will become sufficiently small due to high value of …