EE3113_A2009_L14

EE3113_A2009_L14 - power waves Ratio of the power waves are...

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ECE 3113 INTRODUCTION TO RF CIRCUIT DESIGN Lecture Notes for A-term 2009 LECTURE 14 Prof. R. Ludwig Department of Electrical and Computer Engineering Worcester Polytechnic Institute Worcester, MA 01609 copyright © 2009, R. Ludwig Copyright, 1998 © R. Ludwig
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EE3113_L14 2 Objectives • What is the definition of the scattering parameters? • What is the basic test set up to record the S- parameters? • How are the S-parameters measured?
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EE3113_L14 3 Scattering parameters • There is a need to establish well-defined termination conditions in order to find the network descriptions for Z , Y , h , and ABCD networks • Open and short voltage and current conditions are difficult to enforce • RF implies forward and backward traveling waves which can form standing waves destroying the elements
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EE3113_L14 4 Solution: S-parameters • Input-output behavior of network is defined in terms of normalized
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Unformatted text preview: power waves Ratio of the power waves are recorded in terms of so-called scattering parameters S-parameters are measured based on properly terminated transmission lines (and not open/short circuit conditions) EE3113_L14 5 Basic configuration 1 1 | 1 1 11 2 port at wave power incident port at wave power reflected a b S a 1 2 | 1 2 21 2 port at wave power incident port at wave power d transmitte a b S a 2 2 | 2 2 22 1 port at wave power incident port at wave power reflected a b S a 2 1 | 2 1 12 1 port at wave power incident port at wave power d transmitte a b S a EE3113_L14 6 Set-up for measuring S-parameters Properly terminated output Properly terminated input side Load impedance = line impedance input impedance = line impedance Device under test DUT...
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EE3113_A2009_L14 - power waves Ratio of the power waves are...

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