EE40 Lecture 13 - Active Filters, Transformers

# EE40 Lecture 13 - Active Filters, Transformers - EE40...

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EE40 Lecture 13 Active Filters, Transformers Neel Shah 7/22/11

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Class Final Project Parts list due today We’ll be placing the order next Monday Parts will definitely be available on 8/1 Maybe sooner HW4 due 7/26, Midterm 2 7/27 Final Exam 8/12 in class, don’t miss it Better let me know now if you can’t make it! We’ll try to work something out Guest lecture for half of Monday Bart Muthuswamy on chaotic circuits!
Op-Amp Review Only dealing with ideal op-amps in negative feedback configurations Just need KCL and SPC Properties: Zero input current Infinite input resistance Zero output resistance V+ and V- are equal R IN OUT V+ = V-

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Op-Amp Review Step 1. Summing point constraint for U2: V- = V+ = 0 V
Op-Amp Review Step 2. KCL at U2, negative input: Vx

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Op-Amp Review Step 2. KCL at U2, negative input: Vx
Op-Amp Review Step 3. Summing point constraint at U1: V+ = V- = Vx Vx

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Op-Amp Review Step 4. KCL at U1, negative input:
Op-Amp Review Step 4. KCL at U1, negative input:

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Op-Amp Review Step 5. Final transfer function:
Op-Amp Review Step 6. Plugging in numbers: V out = 3 * -0.5 * 1.5 V = -2.25 V

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Op-Amp Review The negative sign for AC signals just means a 180° phase shift So inverting op-amps result in an output that is out- of-phase with respect to the input
Non-inverting configuration Simply add RC to the input! iClicker: What is the

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EE40 Lecture 13 - Active Filters, Transformers - EE40...

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