3-Lesson_Notes_Lecture30_ee205 - EE 205 Dr. A. Zidouri E...

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EE 205 Dr. A. Zidouri - 1 - E le c t ric Circuits II Two-Port Circuits Two-Port Parameters Lecture #30
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EE 205 Dr. A. Zidouri - 2 - The material to be covered in this lecture is as follows: o Introduction to two-port circuits o The Terminal Equations o The Two-Port z-parameters o The Two-Port y-parameters After finishing this lecture you should be able to: ¾ Understand the Importance of Two-Port Circuits ¾ Relate the Current and Voltage at One Port to the Current and Voltage at the Other Port. ¾ Determine the Two-Port z-parameters ¾ Determine the Two-Port y-parameters
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EE 205 Dr. A. Zidouri - 3 - In trodu c tion to Tw o -P r t C ircu its In analyzing some electrical systems, focusing on two pairs of terminal is convenient. Often, a signal is fed into one pair of terminals and then after being processed, is extracted at a second pair of terminals. The terminal pairs represent the points where signals are either fed in or extracted. They are referred to as ports of the system. Fig. 42-1 illustrates the basic two-port building block. Use of this building block is subject to several restrictions: o There can be no energy stored within the circuit o There can be no independent sources within the circuit o The current into the port must equal the current out of the port o All external connections must be made to either the input port or output port, no connections are allowed between the ports. Output Port Input Port Linear Network Fig. 34-1 The Two-Port Building Block v 1 v 2 i 2 i 1
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EE 205 Dr. A. Zidouri - 4 - The fundamental principle underlying two-port modeling of a system is that only the terminal variables ( i 1 , v 1 , i 2 , and v 2 ) are of interest.
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3-Lesson_Notes_Lecture30_ee205 - EE 205 Dr. A. Zidouri E...

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