Three Fundamental Preliminary Steps in PCB Design

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1.Define Design Constraints
Clarify the physical dimensions of the PCB, the number of layers (single/double/multilayer selection), impedance requirements (e.g., 50Ω high-speed signals, 90Ω differential signals), power rail voltage drop limits, EMC standards (CE/FCC, etc.), and production process parameters (minimum trace width, trace spacing, via size). Incorporate these constraints into the design rules (DRC) to prevent violations from the outset.

2.Schematic Review and Optimization
Before proceeding to layout, thoroughly review the schematic: verify the rationality of power, ground, and signal paths, and avoid unnecessary crossover nodes. Group functional modules (e.g., power supply modules, high-speed interfaces, analog circuits) to provide a logical basis for subsequent layout planning. Highlight critical signals (such as clocks and differential pairs) to facilitate focused control during layout.

3.Component Selection and Package Verification
Prioritize components with standardized packages and reasonable pin spacing (avoid fine-pitch packages below 0.4mm to reduce soldering challenges). Ensure the accuracy of the package library (pin definitions, silkscreen positions, pad sizes), especially for precision components like BGAs and QFPs. Package errors can directly lead to design failure.

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