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lec24 - 4 Overall approach P A RF source DC bias Input...

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EE 3113 INTRODUCTION TO RF CIRCUIT DESIGN Lecture Notes for A-term 2003 LECTURE 24 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_L24 2 RF Amplifier Objective: Design a complete class A, single-stage RF amplifier operated at 1 GHz which includes biasing, matching networks, and RF/DC isolation. MN 1 MN 2 BJT RF in RF out biasing
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EE3113_L24 3 Strategy Design DC biasing conditions Select S-parameters for given bias and operating frequency Build input and output matching networks for desired frequency response include RF/DC isolation simulate amplifier performance on the computer (Optotek’s MMICAD or HP’s Libra/ADS package)
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EE3113_L24 4 Overall approach
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Unformatted text preview: 4 Overall approach P A RF source DC bias Input Matching Network (IMN) Output Matching Network (IMN) Load P L Γ S Γ L Γ in Γ out P A P L Γ S Γ L Γ in Γ out [ ] S Z S V S Z L b 1 ` a 1 b 2 a 2 ` b 2 a 2 a 1 ` b 2 ` Z S V S Z L b 1 ` a 1 ` Γ S Γ in For power considerations, matching networks are assumed lossless EE3113_L24 5 Power Relations 2 22 2 2 2 21 2 | 1 | | 1 | ) | | 1 ( | | ) | | 1 ( L in S S L T S S G Γ − Γ Γ − Γ − Γ − = Transducer Power Gain Available Power Gain ( ) * out L Γ = Γ 2 11 2 2 21 2 | 1 || | | 1 | | | ) | | 1 ( S out S A S S G Γ − Γ − Γ − = Operating Power Gain ( ) * in S Γ = Γ 2 22 2 2 21 2 | 1 || | | 1 | | | ) | | 1 ( L in L S S G Γ − Γ − Γ − =...
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