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Announcements

This announcement provides information about Midterm 1, lab schedule, homework deadline, and review session. It also introduces important electronics terms for the midterm.

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Announcements

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  1. Announcements • Midterm No. 1 Thursday Oct. 6 in class; one 8-1/2 x 11 sheet of notes • allowed. No text, no calculator, no operating cell phones; no blue books • needed. • The next lab will begin on Monday Oct. 10 (RC filters) • Be sure to put your discussion section leader’s name on your homework • to facilitate its return to you. • HW 5 is due at 12:00 noon Tuesday Oct. 4 in 42/100 boxes in 240 Cory. • Solutions will be put on top of the boxes at 1 pm that day. • Midterm 1 will not include a problem on 2nd-order transients. • Prof. Fearing will conduct a review session in class Tuesday Oct. 4. • A list of topics covered to date will appear shortly on the web site.

  2. EE 42/100: Running Checklist of Electronics Terms (Midterm 1) 28 Sept. 2005 – Dick White Terms are listed roughly in order of their introduction. Terms in square braces [like this] are for information only.

  3. Linear Time- Invariant Circuit Linear Time- Invariant Circuit Linear Time- Invariant Circuit Linear Time- Invariant Circuit Digital Pulse Source Types of Circuit Excitation Steady-State Excitation OR (DC Steady-State) Sinusoidal (Single- Frequency) Excitation AC Steady-State Transient Excitation Coming Attraction!

  4. Why is Single-Frequency Excitation Important? • Some circuits are driven by a single-frequency sinusoidal source. • Some circuits are driven by sinusoidal sources whose frequency changes slowly over time. • You can express any periodic electrical signal as a sum of single-frequency sinusoids – so you can analyze the response of the (linear, time-invariant) circuit to each individual frequency component and then sum the responses to get the total response. • This is known as Fourier Transform and is tremendously important to all kinds of engineering disciplines!

  5. Representing a Square Wave as a Sum of Sinusoids • Square wave with 1-second period. (b) Fundamental component (dotted) with 1-second period, third-harmonic (solid black) with1/3-second period, and their sum (blue). (c) Sum of first ten components. (d) Spectrum with 20 terms.

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