ECE 311 lab report 5

Four diodes and one Zener diode are connected to form the circuit below. a) Describe how a single diode behaves when forward biased. 5) draw the output as the input changes from -12 V to +12 V. Assume that all diodes can be represented by a constant-voltage of 0.6 V (in forward bias) and the Zener diode has a breakdown voltage of 6.8 V. d) What is the function of the circuit? Suggest a proper application. I kN Da Dr

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

Analyse the voltage waveforms of the input, V; and the output, V, for a clamper circuit shown in Figure Q3(b)(i) and Figure Q3(b)(ii). Based on your understanding in electronic device field, develop a clamper circuit by referring to the input waveform, Vi and the output waveform, Vo given. Use ideal diode. Then, prove the value of V. (for positive cycle and negative cycle) by calculation technique. V. V. 10 V 3 V -10 -17 (i) (ii) Figure Q3(b)

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 A

a) Use the diode’s characteristic equation,ID=Is exp(VD/VT), to determine the currentsourceIso that the output voltage is 1.5 V. b) If a load is attached to the output that draws 1 mA, what is the output voltage? c) If the circuit heats up to 40◦C, what is the output voltage without a load?

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

Suppose we have a 10-V-peak sinusoidal voltage source. Draw the diagram of a circuit that clips off the part of the sinusoid above 5 V and below -4 V. The circuit should be composed of ideal diodes, dc voltage sources, and other components as needed. Be sure to label the terminals across which the clipped output waveform vo(t) appears.

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diode zener a, DESIGN THE NETWORK IN THE FIGURE, TO KEEP, "VL" at 12 V for a variation in load (IL) from 0 to 200 mA, DETERMINE "Rs" and "Vz" b. determine "P2min" for the Zener diode from section a

Assume that an input signal is applied to the circuit given above, as shown in the figure next to it. Accordingly, answer the following questions. The diodes used are silicon diodes, their operating voltages are 0.7 volts, and can be omitted because their resistance is very small. a) Write the name of this circuit, thinking about which circuit we do in the courses is equivalent to the purpose. b) What are the diodes/diodes that are active in a positive half-loop? Please type. c) What are the diodes/diodes active in the negative half-loop? Please type. d) Calculate ? ?−???( ?? ) for this circuit.

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.

H.W5: Design the single phase half wave rectifier supply the HeNe laser tube. The voltage across tube is 1.8kV and the current pass through tube is 10mA. The designer has two diodes with PIV=1.5kV and saturation current are Is=100μA and Is2=120μA respectively.

Considering a clamper circuit, where capacitance C, load R, the built-in voltage of diode are unknown, which is the correct statement? The DC level shifts up The DC level of the signal changes The shape of signal changes The peak-to-peak value of signal changes

Briefly discuss the difference between Diode Piecewise-linear model, Simplified model, and Ideal device/ equivalent circuit.  Study the diode specification sheets of a 1N4001 and 1N5401 diodes provided by the manufacturer and compare their difference. Give typical application of each. Discuss briefly how to test junction diode.

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This one.

An ac voltage of peak value 20v is connected in series with a silicon diode and load resistance of 5002 .if the forward resistance of diode is 102 find: i- Peak current through diode. ii- Peak output voltage. iii- What will be these values if the diode is assumed to be ideal (Vdiode =0)?

Make the described voltage multiplier circuit, determine the voltage charge in each capacitor, and the output voltage of the circuit. Plot the output waveform in proper phase alignment with the input voltage. Indicate the peak values with the support of your solutions. Use silicon diodes in your analysis and an input V=10 Vrms. a) Half-wave voltage doubler b.) Full-wave voltage doubler

circuits please help

Which of the following statements about diode breakdown is NOT correct? The breakdown voltage increases as the doping concentration increases. Diode breakdown happens in the reverse-biased region. A zener diode uses the breakdown mechanism and can be used as a voltage reference. Diode breakdown is essentially due to the electric field across the depletion region becoming too large.

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 2

Sketch the shape of the output voltage waveform for this clipper circuit, assuming an ideal diode with no forward voltage drop.

In a Simplified Diode Model, up to the barrier potential or Vdiode the current through the diode is increasing. Select one: True False

perform dc analysis on a multiple diode circuit plz

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 Figure

Subject : Electronics Engineering

29. Does an increase in reverse bias for a Varactor diode cause an increase or decrease in capacitance? 30. If the load current through a SCR (Thyristor) reduces to almost zero, what will be the result?