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lec26 - EE 3113 INTRODUCTION TO RF CIRCUIT DESIGN Lecture...

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EE 3113 INTRODUCTION TO RF CIRCUIT DESIGN Lecture Notes for A-term 2003 LECTURE 26 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_L26 2 RF Amplifier Design Project Amplifier design – passive bias network – stability analysis of BJT (k-factor) – no feed-back (S 12 =0) -> unilateral design – class A (low-efficiency) BJT configuration – S-parameter description (given bias, frequency) – discrete, two-element matching networks
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EE3113_L26 3 Results of constant gain analysis 0.2 0.5 1.0 2.0 5.0 +0.2 -0.2 +0.5 -0.5 +1.0 -1.0 +2.0 -2.0 +5.0 -5.0 0.0 -1dB 0dB 0.2dB Γ S opt =S 11 * 0.2 0.5 1.0 2.0 5.0 +0.2 -0.2 +0.5 -0.5 +1.0 -1.0 +2.0 -2.0 +5.0 -5.0 0.0 -1dB 0dB 0.5dB Γ L opt =S 22 * Input gain circles Output gain circles
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EE3113_L26 4 Required Matching Networks 0.2 0.5 1.0 2.0 5.0 +0.2 -0.2 +0.5 -0.5 +1.0 -1.0 +2.0 -2.0 +5.0 -5.0 0.0 0.2dB 0.2 0.5 1.0 2.0 5.0 +0.2 -0.2 +0.5 -0.5 +1.0 -1.0 +2.0 -2.0 +5.0 -5.0 0.0 0.5dB Input matching network Output matching network L, C elements
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EE3113_L26 5 What to do next?
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