1.) The diode in the circuit shown has a reverse-bias saturation current Is = 1015 A, thermal voltage Vr = 26mV, and n = 2. The diode current is 2mA. Find: a.) the supply voltage V1. b.) The power dissipated in the diode. Vs 3k2 6V
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- How is a solid-state diode tested? Explain.Consider the circuit shown in Figure 2. The cut-in voltage of each diode is . Let and assume both diodes are conducting. Determine if this is a valid assumption and explain your answer. And calculate the values of IR, ID, Ip2, and V.. Rj =1.7 kQ ww VB =1 V D1 Dz R2D 4 kQ Figure 2A. In your own words and with the aid of suitable diagrams, describe the following: a) The zener diode and its characteristics. b) Design a limitter circuit using diodes to limit the output voltage to 4.7V during the positive signwave and to -6.7V in the negative signwave. B. Consider the following circuit. Suppose that diode D1 is ideal. a) Give the state of the diode D1: conductive or blocking. Explain. b) Calculate the current flowing through D1. c) Calculate the voltage VR2 across the resistance R2. 1kQ D1 R1 R2 1) ImA 10V 4KQ C. In the circuit shown below the knee current for the ideal Zener diode is 10 mA. Calculate the minimum value of load resistance RL in order to maintain 5 volts across the load resistance RL. 1002 IL 10V V, = 5V A R
- There are three diode models namely (i) the exponential, (ii) ideal and (iii) the constant voltage source. a) Please define each model and provide the factors that influence the choice of a diode model when analyzing a circuit ? b) Please provide sketches of the I-V characteristic of each model.C. In the circuit shown below the knee current for the ideal Zener diode is 10 mA Calculate the minimum value of load resistance RL in order to maintain 5 volts across the load resistance RL 2. WW-Consider the circuit with three diodes and a AC input, as shown below: D2 R1 D1 D3 R2 Assume that the input AC voltage is Ttsin(100TTT). You may consider the diodes to be ideal. mean voltage generated across resistor R2 is (assuming current direction to be from AC so into R1, through diode network, and through R2 from top to bottom): O a. 0.5V Ob. -0.5V O c. 1V O d. OV
- 2. Consider the below zener diode circuit and find the values of Ip1, Vp1, ID2, and Vp2. Use the constant voltage drop model which is shown is Figure 2. Show your solution steps clearly and explain them. TheCalculate the voltage and current of the diode in the figure for each of the diode's models. In each case, determine the voltage across the resistor. Additionally, in each case, determine the diode's power. Assume that Rb is ten ohms.a) What is n-type semiconductor materials? What are the majority and the minority cariers? b) What is p-type semiconductor materials? What are the majority and the minority cariers? c) What is depletion region of a p-n junction diode? d) Describe in your own words the forward-bias and reverse- bias conditions of a p-n junction diode. e) Draw a Diode Symbol and label the anode and the cathode. Si Ge 2 ka f) Find V, in the circuit shown in +20 V 2 k2 15V Fig. Fuad Al-Mannai EENG261 Page 1
- In the circuit shown in the figure, diode voltages are given as 0.6V and rD = 100 ohms. When point B is open circuit AIf + 5V is applied to the point of application, drawing the shape of the circuit formed and calculating the currents passing through the resistors.calculate.4. If the diode is open in the circuit, the load voltage is? 5. If the resistor is ungrounded in the circuit, the voltage measured with a DMM between the top of the resistor and ground is closest to? 6. The load voltage measures 12 V in the circuit. The trouble may be? 7. Using the third approximation in the circuit, how low must R, be before the diode's bulk resistance must be considered? + Vs RL 1 k2 12 V Figure5) The figure below illustrates a simple voltage threshold detection circuit. To understand how it operates, we will analyze its behavior based on the simple constant voltage drop model for both diodes. Assume the Zener diode (Z1) only conducts when its breakdown voltage of 10V is reached. Di is a red light emitting diode (LED). Assume it conducts after its forward bias voltage of 1.8V is reached. Vin is unknown. Assume Zj acts as a perfect Zener diode (without series resistance). What voltage does Vin have to reach before there is a current through R¡? What voltage must Vin reach before current flows through R2? Write an equation for the current through Zi in terms of Vin, Rị and R2 that is valid when Vin is high enough for both diodes to be conducting. a. b. c. R2 Vino R1 LED