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 : […]
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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.
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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
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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,
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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
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Diode as a Circuit Element: Diode as a Circuit Element – The P-N junction diode is considered as a circuit element. One of the most important application of diode is in rectification (i.e., in conversion of sinusoidal ac supply into dc supply). The basic diode circuit, shown in Fig. 7.61, consists of a diode in
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Series Diode Configurations with DC Inputs: The approximate models discussed in preceding section are used for investigation of a number of series diode configurations with dc inputs. This establishes a foundation in diode analysis that will carry over into the sections. The procedure described can, in fact, be applied to networks with any number of
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Up Down Circuit Analysis: Any circuit has independent variables (such as source voltages and branch resistances) and dependent variables (such as voltage drop across resistors, current and power). Determination of response of dependent variables to variation in independent variable is known as circuit Up Down Circuit Analysis. Consider a circuit given in Fig. 7.24. A
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What is Real Diode? As already mentioned, an actual diode neither behaves as a perfect conductor when forward biased nor as a perfect insulator when reverse biased. When a diode is forward biased, it will not conduct till the potential barrier V0 (0.7 V for Si and 0.3 V for Ge) at the junction is
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What is Diode Resistance? What is Diode Resistance? – As already discussed, a forward-biased diode conducts easily whereas a reverse-biased diode restrains the flow of current, so a diode has a low forward resistance as compared to high blocking or reverse resistance. Forward Resistance. The resistance offered by a diode in the circuit, when forward
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