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# lec22 - Test#2 Oct 22 2009 Thursday 6:30 7:30 PM FRNY G140...

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1 1 Test #2 Oct. 22, 2009, Thursday, 6:30 - 7:30 PM, FRNY G140 No calculator, no formula sheet, no cell phone. Tables 13.1 and 13.2 will be handed out with the test. Material covered: Chap. 14, 15, 16 and 17, and notes HW#4, #5, #6 and #7 A seating chart will be posted in 202 Help Room and on my office door (MSEE 262) by 10/22/09 noon. You have to sit in the assigned seat only. MC and WO questions. Turn in the scantron sheet and the test packet. Bring PU ID Class as usual, 10/19/09 (Mon.) and 10/21/09 (Wed.) HW #7 is due on 10/19/09 No class, 10/23/09, Friday 2 Summary of Lecture #22 10/16/09 Resonant and bandpass circuits What are filters for? An exaample of impedance matching circuit LP, HP, BP and BR filters ϖ o and ϖ r for circuits with one L and one C Bandpass filters Peak frequency: ϖ m Half power frequencies: ϖ 1 and ϖ 2 Half power bandwidth: B ϖ = ϖ 2 - ϖ 1 Pass band: [ ϖ 1 , ϖ 2 ] Quality factor Q: Q = ϖ m / B ϖ Bandpass characteristic of parallel RLC circuits Bandpass characteristic of series RLC circuits Pole-zero plots of circuits with one L and one C No finite zero and two complex poles Single zero at the origin and two complex poles Single zero off the origin and two complex poles Two finite zeros and two complex poles 3 What are filters for? To pass or block a narrow frequency band To maximize power transfer from source to load To minimize reflection and interference caused by impedance mismatch 4 Maximum power transfer theorem Power supplied by a DC source (represented by V oc and R th or by I sc and R th ) to a load R L is maximized when R L = R Th provided R L is the variable quantity. Power supplied to the load is For sinusoidal excitation, the time average power to the load is maximized if Z L = Z Th *. th

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lec22 - Test#2 Oct 22 2009 Thursday 6:30 7:30 PM FRNY G140...

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