EE40 Lecture 11 - Frequency Response

EE40 Lecture 11 - Frequency Response - EE40 Lecture 11...

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EE40 Lecture 11 First Order Frequency Response Neel Shah 7/18/11
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First order of business Final Project Proposals Pick up your evaluations from me during break or at end of class if you haven’t already Approvals: Take it easy, work on your parts list Rejections/Conditionals: Resubmit by tomorrow 5pm on bSpace and in lab section If you have a note to see me, do so during the break today Homeworks HW3 due tomorrow 5pm 240 Cory dropbox HW1 and HW2 regrades due along with HW3 HW4 will be released soon, due 7/26 @ 5 pm Gradebook should be up on bSpace, check it Midterm regrades: If you have issues with your grading your last chance to appeal is my Wednesday office hours If you can’t make it, email me!
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A Brief Review Last day we covered the mind-blowing (or mind-numbing) origins of impedance Still operating in AC steady state analysis With combinations of impedances, we can construct all our old favorite circuits, but now with frequency-dependent responses Almost everything is a divider of some sort
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A Brief Review The implications of imaginary-valued impedance occurs in phase lag of AC signals +j indicates the current lags voltage by 90 ° for inductors, Z L = +jωL -j indicates the voltage lags the current by 90° for capacitors, Z C = -j/ωC Remember resistors don’t have state or memory, they allow current to change instantly with voltage We’ve only depicted 90 degree offsets, but complex impedances can result in variable degree phase shifts!
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Magnitude scale factor Phase offset factor Transfer function A Brief Review We can solve this RC circuit and get the following input-output relation We can separate out the input signal to identify the complex transfer function We can separate out the magnitude and phase factors + - V S C R O
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This note was uploaded on 09/09/2011 for the course EECS 40 taught by Professor Chang-hasnain during the Summer '08 term at University of California, Berkeley.

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EE40 Lecture 11 - Frequency Response - EE40 Lecture 11...

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