Calculadora de Resonancia de Stub de Vía
Calcula la frecuencia de resonancia del stub de vía en PCBs de alta velocidad y el beneficio del backdrill.
Fórmula
L_{stub} = T_{pcb}\left(1-\frac{N_{layer}}{N_{total}}\right),\quad f_{res} = \frac{v_p}{4 L_{stub}}
Referencia: Eric Bogatin, "Signal and Power Integrity Simplified" 3rd ed.
Cómo Funciona
Via stub resonance is a critical signal integrity phenomenon in printed circuit board (PCB) design where electromagnetic waves reflect and interact within via structures. The stub length calculation considers board thickness, layer position, and total layer count, which influences the transmission line's electrical characteristics. Understanding stub resonance helps engineers predict and mitigate potential signal degradation and unwanted reflections.
Ejemplo Resuelto
Problem: Calculate via stub resonance for a 6-layer PCB with 1.6mm total thickness, located on layer 3 Solution: 1. Stub length = 1.6mm × (1 - 3/6) = 0.8mm 2. Assuming εr = 4.2 (typical FR-4), c = 3×10^8 m/s 3. Resonant frequency: fr = (3×10^8)/(4 × 0.0008 × √4.2) ≈ 5.3 GHz
Consejos Prácticos
- ✓Use backdrilling to minimize stub-induced reflections
- ✓Choose via placement carefully to reduce resonance effects
- ✓Validate stub length calculations with simulation tools
Errores Comunes
- ✗Ignoring layer position when calculating stub length
- ✗Neglecting dielectric constant in resonant frequency calculation
- ✗Not considering backdrill techniques for stub removal
Preguntas Frecuentes
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