EE3113_A2009_L2

EE3113_A2009_L2 - 2 a R R DC 2 a R L DC f 1 High frequency...

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ECE 3113 INTRODUCTION INTO RF CIRCUIT DESIGN Lecture Notes for A-term 2009 LECTURE 2 Prof. R. Ludwig Department of Electrical and Computer Engineering Worcester Polytechnic Institute Worcester, MA copyright © 2009, R. Ludwig Copyright, 1998 © R. Ludwig
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ECE3113_L2 2 Objectives • Why behave inductors and capacitors to differently at high frequency? • What is the skin effect? • What are equivalent circuit models?
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ECE3113_L2 3 RF Behavior of Passive Components • Conventional circuit analysis – R is frequency independent – Ideal inductor: – Ideal capacitor: Evaluation – Impedance chart L j X L C X C 1
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ECE3113_L2 4 Impedance Chart Z C =1/(2 p fC) Z L =2 p fL
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ECE3113_L2 5 How does a wire behave at high frequency? • Example: Resistor p 2 a l R DC
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Unformatted text preview: 2 / a R R DC 2 / a R L DC f 1 High frequency results in skin-effect whereby current flow is pushed to the outside ECE3113_L2 6 How exactly is the current distribution as a function of frequency? Low frequency shows uniform current distribution medium to high frequency pushes current to the outside RF sees current completely restricted to surface ECE3113_L2 7 Impedance Measurement Example Capacitor going through resonance Capacitor Characteristics ECE3113_L2 8 Equivalent Circuit Analysis ECE3113_L2 9 A practical example Frequency behavior of an air-core inductor measured with an LCR meter. Recording: L=63.58microH, Q = 20.0, f = 100kHz...
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EE3113_A2009_L2 - 2 a R R DC 2 a R L DC f 1 High frequency...

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