Diode circuits are fundamental in electronics for rectification, clipping, clamping, level-shifting, and logic interfaces. This collection presents representative analysis problems with worked solutions, focusing on practical techniques: ideal and piecewise-linear diode models, load-line analysis, Thevenin/Norton reductions, and small-signal incremental methods.
Problem Statement:
Two diodes (CVD model, 0.7V) are in parallel, each with a 100Ω series resistor, connected to a 10V supply. Find the current in each resistor.
Key Insight:
Diodes are never perfectly matched. In practice, the diode with slightly lower forward voltage will conduct more current. For ideal CVD with exactly equal diodes:
Important Note: Real PDF problems will ask what happens if one diode fails open or short.
Circuit: DC source V_s = 5 V, diode modeled as V_D(on) = 0.7 V when conducting, series resistor R = 1 kΩ, connected to ground.
Question: Find diode current I_D and voltage across diode. diode circuit analysis problems and solutions pdf
Solution:
These problems test your ability to identify which diodes are ON or OFF. In parallel configurations, the diode with the lowest forward voltage drop will usually "clamp" the voltage, potentially keeping other diodes off.
Input: sine wave 10V peak. Diode in series with output, oriented with anode to input.
Operation: When input > 0, diode conducts, output follows input. When input < 0, diode off, output = 0V.
Output waveform: positive half only (half-wave rectification). Important Note: Real PDF problems will ask what
Problem Statement:
Find the current (I) and voltage (V_o) in the circuit below, assuming ideal diodes.
![Ideal diode circuit - text description: Two diodes in parallel with opposite polarities connected to a 10V source and a 1kΩ resistor]
Analysis Strategy (The "Guess and Check" Method):
Solution:
For the classic two-diode circuit:
(Full PDF would include 5–6 variations with multiple diodes.) Circuit: DC source V_s = 5 V, diode modeled as V_D(on) = 0
Circuit: A voltage source (V) is connected in series with a diode (D) and a resistor (R).
Given: V = 10V, R = 1kΩ
Solution:
Answer: V = 0.7V, I = 9.3mA