lec14

lec14 - scattering parameters • S-parameters are measured...

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EE 3113 INTRODUCTION TO RF CIRCUIT DESIGN Lecture Notes for A-term 2003 LECTURE 14 Prof. R. Ludwig Department of Electrical and Computer Engineering Worcester Polytechnic Institute Worcester, MA 01609 copyright © 2003, R. Ludwig Copyright, 1998 © R. Ludwig
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EE3113_L14 2 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 •O p e n 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 3 Solution: S-parameters • Input-output behavior of network is defined in terms of normalized power waves • Ratio of the power waves are recorded in terms of so-called
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Unformatted text preview: scattering parameters • S-parameters are measured based on properly terminated transmission lines (and not open/short circuit conditions) EE3113_L14 4 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 5 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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  • Fall '06
  • Scalzo
  • Impedance matching, Prof. R. Ludwig Department of Electrical and Computer Engineering Worcester Polytechnic Institute Worcester, incident power wave

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lec14 - scattering parameters • S-parameters are measured...

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