lec7 - matched line = Γ = Γ S 2 | | 8 1 Z V P G in =...

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EE 3113 INTRODUCTION TO RF CIRCUIT DESIGN Lecture Notes for A-term 2003 LECTURE 7 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_L7 2 Sourced and Loaded Transmission Lines • Lossless transmission line with source ) ( ) 1 ( G in in G in in in Z Z Z V V V + = Γ + = + Voltage at the beginning of the transmission line is composed of an incident and reflected component! 0 0 Z Z Z Z G G + = 0 0 Z Z Z Z L L + =
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EE3113_L7 3 Power considerations } Re{ 2 1 * in in in I V P = ) 1 ( in in in V V Γ + = + ) 1 ( 0 in in in Z V I Γ = + ) | | 1 ( | | 2 1 2 0 2 in in in Z V P Γ = + ) | | 1 ( | 1 | | 1 | | | 8 1 2 2 2 0 2 in in S S G in Z V P Γ Γ Γ Γ = Γ in Z 0 Z G V G
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EE3113_L7 4 Two special cases: Load and source
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Unformatted text preview: matched line = Γ = Γ S 2 | | 8 1 Z V P G in = Mismatch at source, but match at load = Γ 2 2 | 1 | | | 8 1 S G in Z V P Γ − = How to measure power? mW W P dBm P 1 ] [ log 10 ] [ = EE3113_L7 5 Return and insertion losses Return loss: | | log 20 | | log 10 ) log( 10 2 in in i r P P RL Γ − = Γ − = − = [dB] Insertion loss: ) | | 1 log( 10 ) log( 10 ) log( 10 2 in i r i i t P P P P P IL Γ − − = − − = − = [dB] No reflection Full reflection ∞ dB ∞ 1 0 dB 1 Γ RL SWR...
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This note was uploaded on 01/31/2012 for the course EE 4002 taught by Professor Scalzo during the Fall '06 term at LSU.

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lec7 - matched line = Γ = Γ S 2 | | 8 1 Z V P G in =...

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