Set12 - Signal Conditioning (I) Signal Conditioning (I)...

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Unformatted text preview: Signal Conditioning (I) Signal Conditioning (I) Signal Conditioning (I) Signal Conditioning (I) Filters Passive Filters (L, R, C circuits) Active Filters (Op Amp circuits) oading Effect ME365 Signal Conditioning (I) Slide 1 Galen King Purdue University Loading Effect Energy Flow Between Two Subsystems Operational Amplifiers Golden Rules Op Amp Circuits Anti Anti Anti Anti-Aliasing Filter Aliasing Filter Aliasing Filter Aliasing Filter an analog filter that removes signal frequencies above f s /2, where f s is the sample frequency Amplifier Low-pass Filter ADC Input Signal Computer ME365 Signal Conditioning (I) Galen King Purdue University Slide 2 Filters Filters Filters Filters Filter G ( j ) Input Output x(t) y(t) Electrical Quantities: Voltage, Current, Impedance ... Electrical Quantities: Voltage, Current, Impedance ... Adjust Gain (Scaling); ME365 Signal Conditioning (I) Slide 3 Galen King Purdue University Characterized in the frequency domain through frequency response function. Can be implemented using passive elements (R,L,C), active elements (Op Amps, transistors) or digital components . Clean up Noise; Isolate Interested Signal; Change frequency range; Integrate; Differentiate; ... Low Pass Filters (LP) Frequency Response tatic Sensitivity (Gain) Passive Filters Passive Filters Passive Filters Passive Filters ( 29 G j K j = + 1-20-10 Gain dB Bode Plot for a 1st Order Low Pass Filter PASS BAND ME365 Signal Conditioning (I) Slide 4 Galen King Purdue University K : Static Sensitivity (Gain) : Time Constant Cut-off Frequency ( C ) At C , [ ] C rad /sec = 1 ( 29 ( 29 G K K C of = = 2 70% 10-1 10 10 1-30-60-90 Frequency (rad/sec) Phase deg 10-1 10 10 1-30-45 o C Low Pass Filters (LP) Passive Implementation (RC Network) Passive Filters Passive Filters Passive Filters Passive Filters Vo R C Vin ME365 Signal Conditioning (I) Slide 5 Galen King Purdue University Impedance (Z) Analysis: Resistance ( Z R ): Capacitance ( Z C ): ( 29 G j Vo Vin R j LP = = + 1 1 C LP RC RC K = = = Time Constant Cut - off Frequency Gain as C 1 1 Z V I R R R R = = Z V I C j C C C = = 1 High Pass Filters (HP) Frequency Response ensitivity (Gain) Passive Filters Passive Filters Passive Filters Passive Filters ( 29 G j K j j = + 1-20-10 Gain dB Bode Plot for 1st Order High Pass Filter PASS BAND ME365 Signal Conditioning (I) Slide 6 Galen King Purdue University K : Sensitivity (Gain) : Time Constant Cut-off Frequency ( C ) At C , [ ] C rad /sec = 1 ( 29 ( 29 G K K C of = = 2 70% 10-1 10 10 1-30 10-1 10 10 1 30 60 90 Frequency (rad/sec) Phase deg-45 o C High Pass Filters (LP) Passive Implementation (RC Network)...
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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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Set12 - Signal Conditioning (I) Signal Conditioning (I)...

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