Ain Shams University
Faculty of Engineering
Electronics & Comm. Eng. Dept.
nd
2
ECE 211: Electronics
Year Electrical Engineering
Fall 2022
Exercise 2
Diode Applications
1. The circuit below shows a limiter circuit. Assume VON = 0.7 V, V1 = 5 V and V2 = -3 V.
a. Find the range of VIN where both D1 and D2 are OFF (hint: Find the range that satisfies
that D1 is OFF and find the range that satisfies that D2 is OFF, then find the intersection,
i.e., the overlapping range).
b. Find the range of VIN where D1 is ON and D2 is OFF.
c. Find the range of VIN where D1 is OFF and D2 is ON.
d. Find the range of VIN where both D1 and D2 are ON.
e. Plot the transfer characteristics (VOUT vs VIN).
f. Plot the output waveform if the input is a triangular waveform with period = 1 ms and
amplitude = 5 V.
g. Plot the output waveform if the input is a triangular waveform with period = 1 ms and
amplitude = 10 V.
R
VOUT
VIN
D1
D2
V1
V2
2. In each of the ideal-diode circuits shown below, vI is a 1-kHz, 10-V peak sine wave. Sketch
the waveform resulting at vO. What are its positive and negative peak values?
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3. It is required to estimate the ripple seen by the load in the power supply circuit shown below
so as to appreciate the regulation provided by the diodes. Assume fin = 60 Hz, C1 = 100 µF,
R1 = 1000 Ω, and the peak voltage produced by the transformer is equal to 5 V. For
simplicity, neglect the load.
a. Assuming R1 carries a relatively constant current and VDon ≈ 800 mV, estimate the
ripple amplitude across C1.
b. Using small-signal model of the diodes, determine the ripple amplitude across the
load.
4. We wish to design a circuit that exhibits the input/output characteristic shown below. Using
ideal diodes, 1-kΩ resistors, and other components, construct the circuit.
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