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Routing
Perfect USB 2.0 Differential Pairs
Ensures 90-ohm differential impedance on standard 2-layer FR4.
"Route the D+ and D- nets from J1 to U1 as a differential pair. Set track width to 0.25mm and gap to 0.15mm to achieve 90-ohm differential impedance. Route them first before other signals."
Placement
Power Supply Thermal Optimization
Rules for placing buck converter components.
"Place the switching regulator U2. Keep the input capacitor C1, inductor L1, and output capacitor C2 within 5mm of U2. Ensure the high-current loop area is minimized to reduce EMI."