lec07_sigcn

lec07_sigcn - Signal Conditioning(I Filters Passive...

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ME365 Signal Conditioning (I) Slide 1 Signal Conditioning (I) Filters Passive Filters (L, R, C circuits) Active Filters (Op Amp circuits) Loading Effect Energy Flow Between Two Subsystems Operational Amplifiers – “Golden Rules” Op Amp Circuits
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Anti-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) Slide 2
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ME365 Signal Conditioning (I) Slide 3 Filters 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 . Filter G ( j w ) Input Output x(t) y(t) Electrical Quantities: Voltage, Current, Impedance . .. Electrical Quantities: Voltage, Current, Impedance . .. Adjust Gain (Scaling); “Clean up” Noise; Isolate Interested Signal; Change frequency range; Integrate; Differentiate; ...
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ME365 Signal Conditioning (I) Slide 4 Low Pass Filters (LP) Frequency Response K : Static Sensitivity (Gain) t : Time Constant Cut-off Frequency ( w C ) At C , Passive Filters   G j K j tw 1 C w   G C 10 -1 10 0 10 1 -30 -60 -90 0 Frequency (rad/sec) Phase deg 10 -1 10 0 10 1 -30 -20 -10 0 Gain dB Bode Plot for a 1st Order Low Pass Filter PASS BAND -45 o C Passband : freq range for which filter passes at least 70% of input signal   rad/sec 1 t   K K of % 70 2   dB K G 3 log 20 C
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ME365 Signal Conditioning (I) Slide 5 Low Pass Filters (LP) Passive Implementation (RC Network) Impedance (Z) Analysis: Resistance ( Z R ): Capacitance ( Z C ): Passive Filters   G j Vo Vin R j LP w 1 1 C t w w LP RC RC K Time Constant Cut - off Frequency Gain as 0 C 1 1 Vo R C Vin Z V I R R R R Z V I C j C C C 1 Vin Z Z Z R c c
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ME365 Signal Conditioning (I) Slide 6 High Pass Filters (HP) Frequency Response K : Sensitivity (Gain) t : Time Constant Cut-off Frequency ( w C ) At C , Passive Filters   G j K j j tw 1 C   G C 10 -1 10 0 10 1 -30 -20 -10 0 Gain dB Bode Plot for 1st Order High Pass Filter 10 -1 10 0 10 1 0 30 60 90 Frequency (rad/sec) Phase deg PASS BAND -45 o C   rad/sec 1 t   K K of % 70 2
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ME365 Signal Conditioning (I) Slide 7 High Pass Filters (HP) Passive Implementation (RC Network) Impedance (Z) Analysis: Resistance ( Z R ): Capacitance ( Z C ): Passive Filters   G j Vo Vin R j R j HP w C 1 t w w HP RC RC K   Time Constant Cut - off Frequency Gain as C 1 1 Vo R C Vin Z V I R R R R Z V I C j C C C 1
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lec07_sigcn - Signal Conditioning(I Filters Passive...

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