Presentation on theme: "Building a Typical Electronic Project in Senior Design Peter Wihl (former Guest Lecturer)"— Presentation transcript:
Building a Typical Electronic Project in Senior Design Peter Wihl (former Guest Lecturer)
Scope The purpose of this presentation is to introduce you to the process of implementing a circuit design into an actual working design solution.
Process Overview Requirements* System Architecture* Component Selection Mechanical/Packaging Design Detailed Board Design Layout Fabrication Board Assembly Testing and Debugging Design Changes/Workarounds *Must be completed prior to this process.
Lecture Example Building a distance measuring sensor device
Requirements Must be completed prior to board design and implementation A detailed list of what the system must do Not how it does it. Should be well thought out and clear
Requirements Example Must be wireless Must measure in the range from 0.30 to 2.5 meters Must have a resolution of at least +/- 10 cm Must interface with a microprocessor on both transmitter and receiver side using 5.0V CMOS Logic
System Architecture A detailed block diagram Includes all significant signal paths Include signal direction, width, and type
Component Selection Identify the best component solution for each design block in the system architecture Identify all necessary support components for each major design block component Explore different package options if available Take any mechanical requirements into account
Component Selection Example Reynolds 433 MHz Tx/Rx Module (COTS) US Transducers Tx/Rx 40 kHz Crystal 74’Inverter 74’NAND LMV722 OpAmp from National LMC567 Tone Decoder from National Headers SM Resistors and Caps
Mechanical/Packaging Design Identify the mechanical or packaging requirements of your design May possibly have to select components based on these requirements Identify possible layout restrictions Think about non-circuit requirements, i.e. mounting and packaging
Detailed Board Design Build your schematics in a schematic capture program e.g. OrCAD Once your schematic is complete run a design rule check (DRC) When schematic is done convert to netlist for layout
Testing and Debugging You need to develop a thorough and complete test plan for your board. Should include a check list of steps in a test procedure Each step should include status of all board voltages Use continuity, clock signals and/or signature analyzer to verify net connections
Design Changes/Workarounds White wire part of the board Must create detailed step by step instructions on white wire corrections Sometimes minor design changes are needed when an error is found in the board design May have to be done in software
Conclusion This process consists of different types of engineers working together. Depending on system complexity and level of design reuse this process can take from 1 to 18 mouths. Any questions?