October 6th University
Faculty of Engineering
2nd Level 2nd Semester 2021/2022
Electronic Devices & Circuits
Sheet 1
Diode Circuits (Ideal & Real diodes)
1- Find the values of the labeled currents (I) and voltages (V) for the circuits shown assuming all
diodes are: i) Ideal diodes ( VD = 0 V )
ii) Real diodes ( VD = 0.7 V )
2- In the circuits shown, find the values of the labeled voltages and currents for:
(a) Assuming that the diodes are ideal.
(b) Repeat part (a) assuming that the diodes are real.
3- Determine the current and the diode voltage for the circuits shown in each case all diodes are
ideal and all diodes are real.
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4- The diode in the circuit in figure 4 have VD = 0.6 V. Determine the output voltage Vo and the
diode currents ID1 and ID2 for the following input conditions:
(a) V1 = 10V and V2 = 0V
(b) V1 = 5V and V2 = 0V
(c) V1 = 10V and V2 = 5V
(d) V1 = V2 = 10V
5- In the circuit in figure 5 the diode have VD = 0.6 V. Determine the output voltage Vo and the
diode currents ID1 and ID2 for the following input conditions:
(a) V1 = V2 = 10V
(b) V1 = 10V and V2 = 0V
(c) V1 = 10V and V2 = 5V
(d) V1 = V2= 0V
6- Let VD = 0.7 V for each diode in the circuit in figure 6. Find ID1 and Vo for R1= 5 KΩ and
R2 =10 kΩ
7- For the circuit shown in figure 7, let VD = 0.7 V for each diode. Calculate ID1 and Vo for
R1= 10 KΩ and R2 = 5 kΩ
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8- Determine the current in each diode and the voltage VA and VB in the multi-diode circuit shown in
figure 8.
Let (a) VD = 0 V and (b) VD = 0.7 V for each diode
9- Find the values of the labeled voltage and current for the circuit shown in the figure 9 assuming:
(a) The diodes are ideal.
(b) If the forward voltage drop is 0.6V at 1mA.
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10- Consider a silicon diode with n = 1.5 Find the change voltage if the current changes from
0.1 mA to 10 mA.
11- In the circuit shown in Figure 10 assume that the diode has a voltage of 0.7V at 1mA and the
voltage changes by 0.1 V/decade current change. Find ID and VD in case VDD = 5V and R=10KΩ
use:
(a) Iteration method
(b) The piecewise liner model with VD = 0.65V and RD = 20Ω
(c) The constant voltage drop model with VD = 0.7V
12- Design the circuit in Figure 11 to provide an output voltage of 2.4V. Assume that the diodes
available have 0.7V drop at 1mA and that ∆V= 0.1 V/decade change in current.
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