lec2 - pushed to the outside EE3113_L2 5 How exactly is the...

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EE3113_L2 1 EE 3113 INTRODUCTION INTO RF CIRCUIT DESIGN Lecture Notes for A-term 2003 LECTURE 2 Prof. R. Ludwig Department of Electrical and Computer Engineering Worcester Polytechnic Institute Worcester, MA copyright © 2003, R. Ludwig Copyright, 1998 © R. Ludwig
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EE3113_L2 2 RF Behavior of Passive Components • Conventional circuit analysis – R is frequency independent – Ideal inductor: – Ideal capacitor: Evaluation – Impedance chart L j X L ω = C X C 1 =
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EE3113_L2 3 Impedance Chart Z C =1/(2 π fC) Z L =2 π fL
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EE3113_L2 4 How does a wire behave at high frequency? •E x a m p l e : Resistor σ π 2 a l R DC = δ 2 / a R R DC = ω 2 / a R L DC = µσ f 1 = High frequency results in skin- effect whereby current flow is
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Unformatted text preview: pushed to the outside EE3113_L2 5 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 EE3113_L2 6 Impedance Measurement Example Capacitor going through resonance Capacitor Characteristics EE3113_L2 7 Equivalent Circuit Analysis EE3113_L2 8 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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lec2 - pushed to the outside EE3113_L2 5 How exactly is the...

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