lec17_handout - From last time Low-Pass Filter High-Pass...

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ME365 Signal Conditioning 1 From last time… Vo R C Vin Vo R C Vin ܩ ݆߱ ൌ ܭ݆߬߱ ݆߬߱ ൅ 1 ܩ ݆߱ ൌ ܭ ݆߬߱ ൅ 1 Low-Pass Filter High-Pass Filter Loading Effect ܩ ݆߱ ൌ ܩ ݆߱ ෑ ܮ ௜,௜ାଵ ݆߱ ܩ ݆߱ ேିଵ ௜ୀଵ where ܮ ௜,௜ାଵ ܼ ூே,௜ାଵ ܼ ை௎்,௜ ൅ܼ ூே,௜ାଵ ME365 Signal Conditioning 2 Operational Amplifiers (Op Amps) Op Amp Operation output (Eo) (E - ) inverting (E + ) non-inverting V+ V- trim V+ V- E - E + Eo trim trim NC 1 2 3 4 8 7 6 5 Eo E + E - E O () EE +−
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ME365 Signal Conditioning 3 Op Amps Op Amp Characteristics Ideal Reality Infinite High Open Loop Gain 10 4 to 10 6 Infinite High Input Impedance 300 K Ω to 1000 G Ω 0 Low Output Impedance 10 Ω to 5 K Ω (150 - 200 typical) Implications: – Used seldom in open-loop mode: – Almost exclusively used in feedback mode. ME365 Signal Conditioning 4 Op Amps Feedback Operation Assumption I High Input Impedance - Assumption II High Gain ( G O >> 1), for ω < 10 5 Hz Eo E + E - Z F Z I Ed Ei () EG E
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This note was uploaded on 12/26/2011 for the course ME 365 taught by Professor Merkle during the Fall '07 term at Purdue University-West Lafayette.

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lec17_handout - From last time Low-Pass Filter High-Pass...

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