EE40_Fall08_Lecture5 - EE40 Lecture 5 Connie Chang-Hasnain...

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Slide 1 EE40 Fall 08 Connie Chang-Hasnain EE40 Lecture 5 Connie Chang-Hasnain 9/8/08 Reading: Chap. 2 Topics: Node-Voltage Analysis Floating voltage source Dependent sources Superposition, Norton/Thevenin Equivalent Circuit
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Slide 2 EE40 Fall 08 Connie Chang-Hasnain Nodal Analysis • Choose a reference node (“ground”) • Look for the one with the most connections! • Set its voltage to zero. • Define the unknown node voltages Group the nodes that are connected by voltage sources into supernodes (the reference may also become a supernode) • Write KCL at each unknown node – Sum of currents into the node = 0 – Use Ohm’s law to express the currents of each element connected directly to the node in terms of the node voltages • Solve the set of independent equations – n-1 equations for n-1 unknown node voltages where n is the number of nodes.
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Slide 3 EE40 Fall 08 Connie Chang-Hasnain A “floating” voltage source is one for which neither terminal is connected to the reference node through voltage sources, e.g. V LL in this circuit with the chosen reference (which was stupidly chosen): Observation : Since Va is determined by Vb and vice versa we need only one variable to work with to handle both these nodes. We will
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This note was uploaded on 10/24/2009 for the course EE 40 taught by Professor Chang-hasnain during the Fall '07 term at University of California, Berkeley.

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EE40_Fall08_Lecture5 - EE40 Lecture 5 Connie Chang-Hasnain...

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