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EE3113_A2009_L15

# EE3113_A2009_L15 - power waves • Ratio of the power waves...

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ECE 3113 INTRODUCTION TO RF CIRCUIT DESIGN Lecture Notes for A-term 2009 LECTURE 15 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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ECE3113_L15 2 Objectives What sets S-parameters apart from normal networks? Under what conditions are S-parameters recorded? How do you compute the S-parameters of a passive network?
ECE3113_L15 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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ECE3113_L15 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) ECE3113_L15 5 Measurements of Scattering Parameters 1 1 11 2 | a a b S 1 2 21 2 | a a b S 2 2 22 1 | a a b S 2 1 12 1 | a a b S Require proper termination at port 2 of DUT Require proper termination at port 1 of DUT ECE3113_L15 6 Arrangement for measuring S-parameters • Properly terminated port 2 in order to make S 11 and S 21 measurements • Properly terminated port 1 in order to make S 22 and S 12 measurements Load impedance = line impedance input impedance = line impedance ECE3113_L15 7 Example: S-parameters of T-network Port 1 measurements Port 2 measurements...
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• Spring '09
• Ludwig
• Impedance matching, Prof. R. Ludwig Department of Electrical and Computer Engineering Worcester Polytechnic Institute Worcester, R. Ludwig

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