The cut-in voltage of the diode shown in the circuit in Figure 1 is Vy = 0.7 V. The diode is to remain biased “on" for a power supply voltage in the range 4 < Vps < 10V. If R¡=1kN and R2=2kQ, calculate the minimum diode current and the maximum power dissipated in the diode. R1 Vout Vin 1 kQ R2 2 kn $ D2
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- How is a solid-state diode tested? Explain.a) To what value R must be adjusted in the following circuit to make IZ = 70 mA. Assume VZ =20 V at 65 mA and ZZ = 23 Ω. What is the Zener voltage at 70o C, if it has a positive TC of 0.08 %/oC.? b) Using a Complete diode model, find the diode current (ID), diode voltage (VD), and output voltage (Vo) for the diode circuit shown below. Given that: Vs = 20 V, RL=3 kΩ , Barrier Potential VF = 0.3 V , and r’d = 70 Ω. If the diode was reversed and IR = 200 µA, Determine the diode reverse voltage (VR)Zener voltage, VZ = 6.1V and incremental resistance, rz = 0 a) Determine the value of Ri such that the Zener diode remains in breakdown if the load current varies from IL = 20 to 200 mA and if the input voltage varies from VI = 8.6 to 10V. Assume IZ(min) = 0.1IZ(max). b) Determine the power rating required for the Zener diode and the load resistor. c) If the position of Zener diode were changed to be in forward bias region, will the voltage regulator still work properly? Justify your answer
- A 0.5 W zener diode is rated to have VzT = 4 V at a test current of IzT =11.0 mA. Its incremental resistance r, = 68.0 Ohms. What voltage will result when conducting a reverse current of Iz = 21 mA? What is the maximum safe current, using the linearized model and including the effect of rz?For the values of R1=230, R2=230, R3=400, Vs=15. If the real diode (offset voltage=0.7V) were conduxting, then the value of voltage source Vb should be? solve correct or will dislikeThe diode current in a p-n junction is modeled exponentially (given below.) When the p-n junction is polarized with 0.7V and 0.75V, the currents flowing through the diode are again measured on the basis of 1.36 mA and 7.20 mA. Accordingly, what is the ideality factor? (Note: Take the thermal voltage as mV)
- Q1: In this Zener diode regulator, the source voltage varies from 6 V to 14 V. Assume that the load current varies between 1 mA and 35 mA, and that the diode is an ideal 4 V Zener diode. What is the largest allowable resistance that will ensure the load voltage remains constant with variations in load current and source voltage? Please enter your answer to 3 significant figures. Q2: Given the circuit design for a Zener diode regulator in the Ques 1, what is the maximum power that will be dissipated by the Rs resistor? You are told that the source voltage Vs varies from 6 V to 11 V, the load current il varies between 2 mA and 45 mA, and the diode is an ideal 3 V Zener diode. You will need to recalculate the maximum allowable resistance Rs with your new values, as part of this question. Please enter your answer to 3 significant figures, and in Watts.A silicon diode is in connected to a DC voltage source with Forward biased, the net currentflowing through the diode is (25mA) where the applied voltage across the terminals of thediode is (820mV). Determine diode temperature, if Is "dark saturation current", the diodeleakage current density in the absence of light is 3.4 × 10−10 AForward bias current equation given i If the =1 and Is= 10pA. Plot the I vs VD Forward bias characteristics of a PN Diode at room temperature by draw a graph and table of the graph. (b)Calculate and find Rd (details calculation)
- Calculate diode forward current IF, diode voltage VF, and voltage drop across series resistor for three diode models (ideal, practical and complex).Assume diode forward resistance (dynamic resistance) r’d = 25Ω. Reverse leakage current IR = 75 nanoA with series resistance of RL = 100kΩ in reverse bias. Draw equivalent circuit diagrams of each model separately and plot corresponding I/V characteristics for each model.Which of the following indicates the correct rms value of the diode current for a 1-0 full bridge diode rectifier supplied by a source voltage of 220 V, 60 Hz? The value of load resistance is 2012 (assuming large inductance for maintain constant load current). (a) 9.90 A (b) 7.0 A (C) 4.95 A (d) 11 A COMPANYA shunt regulator employs a zener diode for which VZ = 10.1 V at IZ = 10 mA while VZ = 10.2 Vat IZ = 20 mA. The available supply voltage (VS) is 15.0 V, R = 300 ohm, and the load resistance(RL) =1.0 kohma) Find VZ0 and rz.b) Calculate the output voltage (VO).c) Determine the line regulation (ΔVO/ΔVS).d) Using the line regulation obtained in (c), determine the values of the output voltage (VO) if thesupply voltage (VS) is increased from 15 V to 15.1 V.