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Unformatted text preview: 1 1 Class as usual, 10/25/2010 (Monday) and 10/29/2010 (Friday) HW #9 is due 10/29/2010 (Friday) No class , 10/27/2010, (Wednesday) Test #2 Oct. 26, 2010, Tuesday, 6:30 - 7:30 PM, PHYS 112 No calculator, no electronic device and no formula sheet Tables 12.1 and 12.2 will be handed out with the test. Material covered: Up to and include Lecture 25 (todays lecture) Ch. 14, 15, 16 and 19, HW # 5, 6, 7, 8 and 9 A seating chart will be posted in 202 Help Room (MSEE 180) and on my office door (MSEE 262) by 10/26/2010 noon. You have to sit in the assigned seat. Pictures will be taken during the test. Bring PU ID or Photo ID 8 to 12 MC questions and 1 to 2 WO questions. Turn in the scantron sheet and the test packet. 2 Summary of Lecture #25 10/22/2010 Realization of LP filters Transformation from LP to HP, BP and BR Prototype circuit with 1 rad/s 1-ohm impedance level rate of roll off Frequency and magnitude scaling Examples, by coefficient matching 3 Low pass filters p or f p : Pass band edge freq. s or f s : Stop band edge freq. High pass filters p or f p : Pass band edge freq. s or f s : Stop band edge freq. Pass band Stop band Stop band Pass band Transmission Transmission 4 Band pass filters Pass band edge frequencies: p1 (or f p1 ) and p2 (or f p2 ) Band rejection filters Stop band edge frequencies : s1 ( or f s1 ) and s2 (or f s2 ) Transmission Transmission 5 Brick wall specification for LP filters p : Pass band edge frequency Minimum transmission |H(j ) | in the pass band s : Stop band edge frequency Maximum transmission |H(j )| in the stop band Half power point |H| pb min |H| sb max Pass band Stop band Transition band max c | ) j ( H | 2 1 | ) j ( H | = Cutoff frequency: c Transmission 6 Low pass filters Ideal specification of LP filters Brick wall specification |H(j )| = 1 for < p |H(j )| = 0 for > p Realization or approximation Butterworth low pass transfer characteristic (maximum flat in pass band) Chebyshev low pass transfer characteristic (equal ripples in pass band) Inverse Chebyshev low pass transfer characteristic...
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- Spring '06