tailieunhanh - Circuits & Electronics P18

Filters Fall 2000 Lecture 18 1 .Review R vI + – ZR C + vC – Vi + – ZC + Vc – ZC Vc = ⋅ Vi ZC + Z R 1 Vc 1 j ωC = = 1 Vi + R 1 + jωRC j ωC Reading: Section , , from A & L. Fall 2000 Lecture 18 2 .A Filter ZR Vi + – ZC + Vc – ZC 1 ⋅ Vi = Vc = ZC + Z R 1 + jωRC Vc H (ω ) = Vi 1 “Low Pass Filter” Demo with audio Fall 2000 Lecture 18 ω 3 .Quick Review of ImpedancesJust as I ab R1 R2 A + Vab B A – RAB Vab = = R1 + R2 I ab I ab R1 + j ωL B Vab – Z AB Vab = = R1 + jωL I ab . | CIRCUITS AND ELECTRONICS Filters Fall 2000 Lecture 18 1 Review Zr Vc 7 V Zc V. c z z C R 1 Vc jjjZ 1 V 1 1 jrnRC 1------ R j C Reading Section from A L. Fall 2000 Lecture 18 2 H a A Filter Vc V1 Low Pass Filter 69 Demo with audio1 Fall 2000 Lecture 18

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