EEC 111 Spring 2022 Homework #3
Rajeevan Amirtharajah
Dept. of Electrical and Computer Engineering
University of California, Davis
Issued: April 17, 2023
Due: April 24, 2023, 11:59 PM by Canvas upload.
Reading: Sedra and Smith, Chapter 4 [1].
1
Ideal Diode
Problem 1.1 Sedra and Smith 4.2
Problem 1.2 Sedra and Smith 4.4(a), 4.4(f), 4.4(h), 4.4(i)
Problem 1.3 Sedra and Smith 4.7
2
Diode Models
Problem 2.1 Sedra and Smith 4.21
Problem 2.2 Sedra and Smith 4.35. You may use a graphing calculator, spreadsheet, or
other computer program (e.g., Python, MATLAB) to plot the diode characteristic and load
line.
Problem 2.3 Sedra and Smith 4.36
3
Voltage Regulator and Rectifier Circuits
Problem 3.1 Sedra and Smith 4.69
Problem 3.2 A full-wave rectifier is driven by a sinusoidal input Vin = V0 cos !t, where
V0 = 3 V and ! = 2⇡ · 60 Hz. Assuming VD,on = 750 mV, determine the ripple amplitude
with a 1000 µF capacitor and a load resistance of 33 ⌦.
1
Figure 1: Two series diodes circuit.
(b)
(a)
Figure 2: Diode circuits.
Problem 3.3 In Figure 1, the reverse saturation currents of the two diodes are IS1 and IS2 .
(a) Calculate IB , VD1 , and VD2 in terms of variables VB , IS1 , and IS2 . (b) If we wish to
increase IB by a factor of 100, how much should we increase VB ? Hint: use the exponential
model for the diodes.
Problem 3.4 Find the value of Vout in each of the circuits in Figure 2 for Vin = 1.8 V and
Vin = 5 V. Assume a constant-voltage model with VD,on = 0.6 V for the diodes. For the
circuit in Figure 2a, VB = 0.9 V, R1 = 1 k⌦, and R2 = 2 k⌦. In Figure 2b, R1 = 1 k⌦, and
R2 = 3.9 k⌦.
References
[1] A. S. Sedra, K. C. Smith, T. C. Carusone, and V. Gaudet, Microelectronics, 8th ed. New
York: Oxford University Press, 2020.
2