Identify the bias for each diode and solve for the current through and voltage across each diode for the 3 diode equivalent models. Assume the barrier potential for D1 = 0.7 V and D2 = 1.8 V; dynamic resistances r₁ = 10 Q and r₂ = 20 №; and internal reverse resistances for both diodes to be 1 MQ.
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- 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. OVConsider 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 2Determine the minimum value and the maximumvalue that the series resistor may have in a regulatorcircuit whose output voltage is to be 25 V, whose inputvoltage varies from 35 to 40 V, and whose maximumload current is 75 mA. The Zener diode used in thiscircuit has a maximum current ratingof 250 mA.
- Analyze the ON/OFF states of all diodes (D1 and D2) inthis circuit, using the ideal-diode model.Consider the diode circuit shown below. If Vs is a sinewave with a peak amplitude of 12 Volts at 60Hz, and diodes D1 & D2 are considered ideal, sketch the appearance of the waveform at node voltage Vout . Sketch the appearance of the waveform at Vout .5) 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
- In RL load connected (without free transition diode), single phase, uncontrolled, full wave rectifier (4 diodes), the source voltage is sinusoidal and its effective value is 44Volt, 50 Hz. The ohmic load value connected to the circuit is 10 ohms. Average value of load current calculate. (L>>R) a) 4.16 A b) 3.46 A C) 3.26A d) 4.56 A e) 3.96 AA. 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 RQ1/ a/Draw the output voltage waveform for the bridge rectifier in this figure : 5:1 D Da 120 V ms Dy RL B/ What PIV rating is required for the diodes in a bridge rectifier that produces an average output voltage of 50 V? Q2/ Determine the minimum input voltage required for regulation to be established in the figure. Assume an ideal zener diode with Izx = 1.5 mA and V, = 14 V. lllee 幸
- In each of the ideal-diode circuits show below V1 is a 1kHz, 10-V peak sine wave. Sketch the wave form resulting at V0. What are its positive and negative peak values?Consider a silicon pn junction diode at T 300K. The reverse saturation current is Is = 10-14 A and the ideality factor n = 1. Determine the diode current for a diode voltage of VD = 0.573 V and use that to determine the DC and AC resistance of the diode. RDC = 14.13 k rac = 639 Q RDC = 234 Q2 = rac=8Q RDC = 7.00 KQ rac = 307 Q RDC = 1.43 kQ rac = 58 QDraw the following rectifier circuits with an input voltage of 12 Vrms and an RL=2K. Determine the output voltage and the current in RL. Plot these waveforms indicating the peak values and the time as per calculation. Also solve for the output DC value. Use silicon diode/s in your analysis. Half wave rectifier circuit (include the diode voltage analysis), Full wave bridge rectifier circuit, Full wave rectifier using center tapped transformer