Lec05filters

Lec05filters - ECE 488 RF Circuits and Systems Spring 2008...

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1 1 Swartz 06/1/28 ECE 488 – RF Circuits and Systems – Spring 2009 Lecture 5: Filters Butterworth Chebyshev Bessel Matched ECE 488 RF Circuits and Systems Spring 2008 Lecture 5 2009/1/28 3 Swartz 06/1/28 ECE 488 – RF Circuits and Systems – Spring 2009 Lecture 5: Announcements Labs start next week, February 2. Read Lab 1 Handout. Fill in boxes under “Before Your Lab” Go to proper section in 229 Phillips Hall: Section 1: Monday afternoon, 1:25 – 4:25 pm Section 2: Monday evening, 6:30 – 9:30 pm Section 3: Thursday afternoon, 1:25 – 4:25 pm 5 Swartz 06/1/28 ECE 488 – RF Circuits and Systems – Spring 2009 Lecture 5: Filters are key building blocks for transmitters and receivers Provide receiver (frequency) selectivity Reject unwanted frequencies from other radio stations of harmonics from nonlinearities Limit noise Filters fall into 4 general forms: Low Pass (LP) High Pass (HP) Band Pass (BP) Band Stop (BS) or Band Reject (BR) Filter Basics 6 Swartz 06/1/28 ECE 488 – RF Circuits and Systems – Spring 2009 Lecture 5: Fundamental shapes: Butterworth filters Chebyshev filters Bessel Gaussian – Jicamarca radar baseband filters Matched filters have special significance for radars Filter order: How many reactive elements? Number affects steepness of fall-off, flatness, or number of ripples Two Topologies: Leading series component, or Leading parallel component Filter Configurations We consider just these two. 7 Swartz 06/1/28 ECE 488 – RF Circuits and Systems – Spring 2009 Lecture 5: Butterworth Characteristics Shape: Maximally flat over pass region Response is down -3dB at cutoff frequency Order: Number of reactive elements affects flatness Number affects steepness of fall-off beyond cutoff Sample shapes: 8 Swartz 06/1/28 ECE 488 – RF Circuits and Systems – Spring 2009 Lecture 5: Chebyshev Characteristics Shape: Equal depth ripples over pass region
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Lec05filters - ECE 488 RF Circuits and Systems Spring 2008...

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