EE3113_A2009_L2

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

Info iconThis preview shows pages 1–9. Sign up to view the full content.

View Full Document Right Arrow Icon
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
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
ECE3113_L2 2 Objectives • Why behave inductors and capacitors to differently at high frequency? • What is the skin effect? • What are equivalent circuit models?
Background image of page 2
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
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
ECE3113_L2 4 Impedance Chart Z C =1/(2 p fC) Z L =2 p fL
Background image of page 4
ECE3113_L2 5 How does a wire behave at high frequency? • Example: Resistor p 2 a l R DC
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 6
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 8
Background image of page 9
This is the end of the preview. Sign up to access the rest of the document.

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...
View Full Document

Page1 / 9

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

This preview shows document pages 1 - 9. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online