Hardware Engineering · Cluster
Board Design
Signal integrity, layout, and bring-up.
- 01 Return Current Paths and Why Loop Area Sets Trace Inductance Why the return current of a high-speed signal crowds beneath its trace, what a broken reference plane does to that path, and how loop area translates into ground bounce.
- 02 Rise Time, Electrical Length, and When a Trace Stops Being a Wire The criterion that separates a lumped connection from a transmission line, how dielectric constant sets propagation delay, and why slow edges on long traces still misbehave.
- 03 Characteristic Impedance from Stackup Geometry How trace width, dielectric height, and copper thickness combine into a characteristic impedance, why the equations are approximations, and what happens to impedance when a net changes layer.
- 04 Termination Topologies and the Reflection They Absorb Series, parallel, Thevenin, and active termination compared by what they do to the incident wave, what they cost in DC current, and where each one fails on a multi-drop bus.
- 05 Crosstalk: Mutual Capacitance, Mutual Inductance, and Coupling Length The two coupling mechanisms that inject noise into a neighbouring trace, why near-end and far-end crosstalk behave differently, and how spacing and layer choice change the balance.
- 06 Via Transitions, Stubs, and Backdrilling Why a plated through-hole behaves as a lumped discontinuity, how the unused barrel becomes a resonant stub, and what backdrilling and antipad sizing actually remove.
- 07 Power Delivery Network Impedance and the Target It Must Hold How a target impedance is derived from a rail voltage and current step, why the capacitor network has anti-resonances, and where mounting inductance defeats the parts on the schematic.
- 08 Differential Pairs and the Cost of Asymmetry How intra-pair skew converts differential signal into common mode, how to derive a length-matching tolerance from a skew budget, and why the two modes propagate at different speeds.
- 09 Probing High-Speed Nets Without Measuring the Probe Why a scope probe loads the node it measures, how ground-lead inductance dominates above a few hundred megahertz, and which probing methods keep the measurement honest.
- 10 Power Sequencing, Reset Order, and the First Power-On Why rails must rise in a defined order, what happens to a device whose I/O is driven before its supply, and how boundary scan turns a dead board into a locatable fault.