EXERCISE PROBLEM Ex 1.9: (a) Consider the circuit shown in Figure 1.28. Let Vps = 8V and Vy = 0.7 V, Assume rf = 0. Calculate the value of R such that I = 1.20 mA. (b) If Vps is reduced to 4 V and R is changed to 3.5 ks2, determine the power dis- sipated in the diode. (Ans. (a) 6.08 ks, (b) 0.66 mW).

A diode whose internal resistance is 20 ohms is to supply power to a 1000-ohm load from a 110V(rms) source of supply. Calculate the peak load current, dc load current. and determine the percent regulation from no load to the given load.  a.) Peak Load Current= 120.8mA; DC load current=25.5mA b.) Peak Load Current= 133.3mA; DC load current=29.4mA c.) Peak Load Current= 144.3mA; DC load current=34.7mA d.) Peak Load Current= 152.5mA; DC load current= 48.5mA

A half-wave recitifier is connected to a 50V AC source. If the load resistance is 100 ohms, find: 1) Max load voltage 2) Average load voltage 3) Max load current 4) Average load current 5) RMS load current 6) PIV rating for diode ...

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A Full-wave bridge rectifier Circuit contains 4 Germanium diodes Cuse the Constant voltage drop model with VD = 0.30) driving ac a Load resistance of 10 kur. An Source with a Peak value of 4ou at bottz Vortage Source with a applied to the Circuit. a DIS 2 Determine the de value of the output wave form Determine the value of the Capacitor In uf needed to limit the output ripple vortage to 0.5 V if the Peak output voltage is equal to Upic -2VD

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

Determine 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.

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?

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.