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EEE 302 Electrical Networks II

EEE 302 Electrical Networks II. Dr. Keith E. Holbert Summer 2001. Active Filters. To achieve a gain > 1, we need to utilize an op-amp based circuit to form an active filter We can design all the common filter types using op-amp based active filters Recall for an ideal op-amp that

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EEE 302 Electrical Networks II

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  1. EEE 302Electrical Networks II Dr. Keith E. Holbert Summer 2001 Lecture 24

  2. Active Filters • To achieve a gain > 1, we need to utilize an op-amp based circuit to form an active filter • We can design all the common filter types using op-amp based active filters • Recall for an ideal op-amp that V+ = V–I+ = I– = 0 Lecture 24

  3. Class Example • Extension Exercise E12.19 Lecture 24

  4. Inverting Op-Amp Circuit Z2 Z1 – + + – + Vin Vout – Vout = – (Z2/Z1) Vin Lecture 24

  5. Noninverting Op-Amp Circuit + – + + – Vin Z2 Vout Z1 – Vout = (1 + Z2/Z1) Vin Lecture 24

  6. + - Op Amp Model V+ Noninverting input + Rout Vo Rin – Inverting input A(V+ –V–) V– Lecture 24

  7. PSpice Design Example • Let’s design an active filter in PSpice using Problem 12.69 to start • Determine the type of filter • Use goal function to find the filter cutoff freq. • Now replicate/expand the circuit from above in the fashion shown in Problem 12.70 to form a higher order filter • Use goal function to find the filter cutoff freq. Lecture 24

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