11-Op Amps 3-Simple Graphic Equalizer

11-Op Amps 3-Simple Graphic Equalizer - Operational...

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Operational Amplifiers: Op-Amps Part 3 utiple Stage Circuits Mutiple Stage Circuits Simple Graphic Equalizer & Other Examples © Fred Terry Fall, 2008 1
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Multi-Stage Opamp Example 100K Ω 50K Ω Ω V V C + - v s v 0 Ω A V B V D V E 200K Ω + 2
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50K Ω 100K Ω Ω + - v 0 Ω V A V B V C V D +- v s 200K Ω V E + 3
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Extensions: Summing Amp i f 1 1 0 VV V i −+ == = V 1 R 1 f V o R 2 V i 1 1 2 2 2 R V i R = R 3 2 V 3 i 2 i 3 3 3 3 V i R = 123 3 12 f o ff f ii i i V VR i R R R =++ =− + + 4 RR ⎢⎥ ⎣⎦
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Band-Pass Filter • Allows a certain range of frequencies to pass and gq p cuts off the rest – Bass, Mid-range, Treble, etc. • Suppose we have several filters (different f i ’s) and we want to build a graphic equalizer et’s look at a case with 3 filters just to keep it • Let s look at a case with 3 filters just to keep it simple Bandwidth V out /V in 1 f 1 V out V 5 0 f 1
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Suggested Layout f 1 R f V in f 2 R 1 V o R 2 R 3 f 3 6 Why do it this way?
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Trans-Impedance Amplifier •O b
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This note was uploaded on 01/31/2011 for the course EECS 215 taught by Professor Phillips during the Spring '08 term at University of Michigan.

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11-Op Amps 3-Simple Graphic Equalizer - Operational...

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