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REVIEW-Bode Plots for RL and RC

REVIEW-Bode Plots for RL and RC - ENGR 210 REVIEW Bode...

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THINGS YOU SHOULD KNOW ABOUT BODE PLOTS FOR PASSIVE CIRCUITS (Lectures 38-39) 1. How to write voltage divider. 2. Decibels 3. How to plot term 20log 10 1 + j ± RC . 4. Cutoff frequency and 3-db point. PAGE R-L HIGHPASS FILTER 2-4 R-C HIGHPASS FILTER 5-7 R-C LOWPASS FILTER 8-9 MORE COMPLEX FILTERS 10-11 ENGR 210 REVIEW Bode plots: RL & RC Circuits Page 1
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12-2 By voltage division we can compute the transfer function T V j ± ( ) = j ± L || 300 600 + j ± L || 300 = j ± L 300 ( ) j ± L 900 ( ) + 180,000 Substituting in the value of L and doing some simplification gives T V j ± ( ) = 1 3 j ± 20 ² 10 ³ 6 ( ) j ± 20 ² 10 ³ 6 ( ) + 200 = 1 3 j ± 10 ³ 7 j ± 10 ³ 7 + 1 = 1 3 j ± 10 ³ 7 1 + j ± 10 ³ 7 (1)
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