ECE 480 Team 3 Team Members Nate Kesto Mike Mock Justin Bohr Yuan Mei Xie He Chaoli Ang Outline Introduction Filter Designs Low Pass High Pass Band Width Band Pass Differential ID: 221083
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Slide1
Filter Design and Applications
ECE 480 - Team 3
Team Members:
Nate
Kesto
Mike Mock
Justin Bohr
Yuan Mei
Xie
He
Chaoli
AngSlide2
Outline
Introduction
Filter Designs
Low Pass
High PassBand WidthBand Pass Differential FilteringFilter ApplicationsPower FilteringAudio ApplicationBand StopECG ApplicationSlide3
Introduction
Characteristics
Analog or Digital
Passive or Active
Linear or Non-LinearFilter TypesLow PassHigh PassBand Pass Band StopSlide4
Filter Designs – Order
and Cutoff Frequency
Order of filters
First order
Second order
Third and higher order
Cutoff frequencySlide5
Filter Designs – Low Pass
Passive
Transfer function
Slide6
Active
Filter Designs – Low PassSlide7
Filter Designs – High Pass
Passive
ActiveSlide8
Filter Designs – Bandwidth
Bandwidth
Cutoff frequency and center frequency
Q factorSlide9
Passive
Active
Filter Designs –
Band
Pass Slide10
Filter Designs – Differential
Concepts
:
Differential Filter: Any filter with a differential input and a differential output. Single-Ended Signal: -One of the signal terminals are grounded. Differential Signal: -Neither of the signal terminals are grounded.
Why do we need it ?
C
ouple with differential amplifiers.
Increase common mode rejection ratio, reduce noise and interference.Slide11
Filter Designs – Differential
Passive
High-pass Low-pass
Active
High-pass Low-passSlide12
Filter Designs – Differential
How to design it
?
Single-Ended to Differential-Ended Filter Translation.Single-Ended LP Filter Differential LP Filter *
Figures from Texas Instruments Application Report “Design of Differential Filters for High-Speed Signal Chains” by Ken ChanSlide13
Filter Designs – Differential
Simulation result of both the Single Ended
and Differential filters using TINA-TISlide14
Buck Converter
Switched-Mode
Filter
Applications
– Power Slide15
Power Filter
Filter
Applications
– Power Slide16
Tina – TI Simulation
Filter
Applications
–
Power Slide17
Filter Applications – Power
ResultsSlide18
Filter Applications – Audio
3-way Speaker Crossover
Subwoofers (20 - 80Hz)
Midrange (80Hz - 2kHz)
Tweeter (2 - 20kHz)
http://www.waldonell.com/thoughts/sticky-articles/designing-a-100w-3-way-speaker-system/
Bode Plot for 3-way Crossover
Commercial 3-Way Speaker PairSlide19
Speaker Equivalent Circuit
Filter Applications
–
Audio
Speaker Impedance vs. Frequency
Design Goal:
Match speaker’s natural frequency response with crossover
Maintain appropriate power distribution
http://sound.westhost.com/tsp.htm
http://fmarvasti.com/Graphics/Impedance.jpgSlide20
Filter Applications – Audio
Speaker Crossover Schematic
Passive Elements (RLC Networks)
http://www.trueaudio.com/st_xov_1.htmSlide21
Filter Designs – Band Stop
Background
Analog
design
Digital designSlide22
Filter Applications – Band Stop Slide23
Notch Filter by Matlab
Filter Applications – Band Stop Slide24
Plot of the Notch Filter
Filter
Applications – Band Stop Slide25
Filter
Applications – Band Stop Slide26
Filter Applications – ECG
AFE
Stellaris Oscilloscope
Band Pass
f
0
= .7 Hz
f
1
= 50 HzSlide27
Filter Applications – ECG
INA333
Input Filtering
Post Filtering
Stellaris Oscilloscope
Servo Loop
RLD
CardioSim
II
Low Pass
Inverting Low Pass
Inverting High
Pass
Low PassSlide28
Filter Applications – ECG
Servo Loop
Inverting Low Pass filter
Output sent to Reference pin of INA
Effective High PassSlide29
Questions?