Texas Instruments Precision Analog 2152013 1 Design Team 3 Texas Instruments Contact Pete Semig Facilitator Dr Ramakrishna Mukkamala Team Members Nate Kesto Mike ID: 1046856
Download Presentation The PPT/PDF document "ECE 480 Electrocardiogram Demonstration ..." is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.
1. ECE 480Electrocardiogram Demonstration BoardTexas Instruments – Precision Analog2/15/20131Design Team 3Texas Instruments Contact: Pete SemigFacilitator: Dr. Ramakrishna MukkamalaTeam Members: Nate Kesto Mike Mock Justin Bohr Chaoli Ang Yuan Mei Xie He
2. BackgroundElectrocardiogram (ECG or EKG)What is it? Methods of measurement (µV to mV)Biomedical Applications2/15/20132Biopotentials from Cardiac CellsSuperposition produces ECG signalElectrode Measurement
3. BackgroundTexas Instruments – Precision AnalogCurrent ECG demo boardOutdated componentsLargeDesired OutcomeReliable and AccurateSmall footprintSturdyPopulate with modern componentsPair with Stellaris as oscilloscope2/15/20133Texas Instrument’s Current ECG BoardStellaris Microcontroller
4. Project TimelinePhase 1: Design Analog Front End (AFE)Power Supply, Amplification, and Analog FiltersSimulate designs in TINA-TILay out design on printed circuit board (PCB)Phase 2: Test PCB and Interface with Stellaris µCTest and compare with TINA simulationsIntegrate AFE PCB with Stellaris µCDesign proto-type for finger measurementsPhase 3: Design Final ProductAllow real time ECG measurement from fingersDevelop algorithm for µC to detect diseases or beats/min2/15/20134
5. Tools and ResourcesPCB ArtistProsStrong base of components librarySchematic to PCB wizardConsLimited to one supplierTI ResourcesStellaris µC and oscilloscope demo kit CardioSim IITina TI INA333,OPA333,OPA2332/15/20135PCB Artist Layout DesignTINA-TI Spice Simulation
6. Design ConsiderationsDeliverable GoalsReliable final productInterchangeable Op-AmpsSOT23-5 Platform FootprintsCompare IC’sLow costHigh ECG signal integrityHigh S/N ratio outputClean reference voltage signalSolid PCB design / layout2/15/20136ECG with low S/N ratioTwo Interchangeable Op-Amps
7. Design Considerations2/15/20137ECG signal integrityInput Filtering (Pre & Post)INA333 Instrumentation AmplifierLinear AmplificationAvoid saturationBias for maximum signal swingPower Supply (Low Power)9V DC battery to 5VTPS62120 (Integrated Converter)2.5 Reference Voltage Noise (decrease)Low Cost: $33 / 2-layer PCBAgilent vs. CardioSimTPS62120 Schematic
8. Design Solutions2/15/201389V BatteryBuck Converter+5VDivider and LPF+2.5VINA333Input FilteringPost FilteringStellaris OscilloscopeServo LoopRLDCardioSim II
9. Design Solutions2/15/20139Phase 1 Schematic
10. Design SolutionsUtilize both passive and active filtersServo loop for INA to reduce LF wanderingBuffer LP filter for 2.5V supply (noise)2/15/201310Low noise 2.5V bias referenceDC Servo Loop HP Filter
11. Project Progress2/15/201311Phase 1: Tests on Proto-boardPhase 1: PCB Layout (2.5”x2.5”)Phase 1: Output Signal (CardioSim)Phase 2: Display Signal on Stellaris µC
12. SummaryBackgroundECG MeasurementsECG demo board for TIProject TimelineThree Phase ProcessTools and ResourcesTI TINAPCB ArtistDesign ConcernBudget, Reliability, Noise Design SolutionsDesign, Simulation, Fabrication, Test2/15/201312
13. Questions?2/15/201313