《PCB_design1_2016》.pdf

METR2800/ENGG2800 Circuit Layout Malcolm Marker CRICOS Provider No 00025B Introduction • Part 1 • PCB Layout • Decoupling/noise • General circuit design tips • Sampling/Aliasing/Filters • Part 2 • Power supply Design • Component selection – Data Sheets • PWM design consideration • QA Resources – Free from the web! - Op Amps for Everyone, Ron Mancini, Texas Instruments. - The Scientist and Engineer’s Guide to Digital Signal Processing, Steven W Smith. CRICOS Provider No 00025B PCB – Signal Track A PCB connects electronic components, BUT IT IS ALSO A PASSIVE COMPONENT Single Track Equivalent Circuit per unit length Longer single track Distributed Equivalent Circuit Also true for a single wire. CRICOS Provider No 00025B PCB – Parallel Tracks CRICOS Provider No 00025B PCB - Resistance CRICOS Provider No 00025B PCB - Capacitance CRICOS Provider No 00025B PCB - Inductance CRICOS Provider No 00025B PCB - Single Sided Board Cheap to manufacture. Need to be very creative. Need to be careful of trace resistance! CRICOS Provider No 00025B PCB - Double-Sided Board Costs more to manufacture BUT- Allows for ground Plane • Ground is frequently the most common connection in the circuit. Having it continuous on the bottom layer usually makes the most sense for circuit routing. • It lowers the impedance of all ground connections in the circuit, which reduces undesirabl