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lesson10 - Lesson 10 Superposition and Thvenin/Norton...

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10 V 100 100 mA V Y + _ + _ V X 100 100 Lesson 10 – Superposition and Thèvenin/Norton Theorems (Sections 3-3 and 3-4) (CLOs 3-2 and 3-3) Superposition i s more of a learning technique than a useful tool since most simulation tools can solve multiple source problems with no extra effort. However, there are applications where one needs to find the contribution of a particular source, for example. Furthermore, superposition is a direct consequence of linearity and is thusly useful in demonstrating the benefit of linearity .Thévenin and Norton Equivalent circuits are very important to understanding concepts from loading to interfacing. They can also be used for contractual representations wherein other circuits must interface with the equivalent circuit. Superposition Start by explaining the principle. Then explain how to proceed. Keep one source ON and set all the others to zero. Solve for the desired output due the one that is ON. Record this value. Set it to zero and turn the next source ON. Repeat. And so on. Then the logical question arises “How do we set sources to zero?” Recall the i-v characteristics of a resistor and the i-v of the resistance extremes – a short and an open. They are identical to the i-v characteristics of a voltage source set to zero or a current source set to zero. Hence, set voltage sources to zero by replacing them
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lesson10 - Lesson 10 Superposition and Thvenin/Norton...

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