{"id":4809,"date":"2026-03-16T09:56:36","date_gmt":"2026-03-16T09:56:36","guid":{"rendered":"https:\/\/flj-pcb.com\/?p=4809"},"modified":"2026-03-16T09:57:49","modified_gmt":"2026-03-16T09:57:49","slug":"pcb-layer-planning-guide-for-multilayer-pcb-design","status":"publish","type":"post","link":"https:\/\/flj-pcb.com\/es\/pcb-layer-planning-guide-for-multilayer-pcb-design\/","title":{"rendered":"Gu\u00eda de planificaci\u00f3n de capas de PCB para el dise\u00f1o de PCB multicapa"},"content":{"rendered":"

I. Descripci\u00f3n general de la determinaci\u00f3n del recuento de capas de PCB<\/h1>\n\n\n\n

El n\u00famero total de capas de PCB no se fija al principio. Los ingenieros deciden el n\u00famero de capas en funci\u00f3n de las necesidades de la placa. El total de capas se obtiene a partir del n\u00famero de capas de se\u00f1al m\u00e1s el n\u00famero de planos de potencia y tierra. Los ingenieros estudian la disposici\u00f3n de la placa, los tipos de componentes y las necesidades el\u00e9ctricas. A continuaci\u00f3n, planifican cu\u00e1ntas capas de se\u00f1al se necesitan y cu\u00e1ntas capas de alimentaci\u00f3n\/tierra. El objetivo del plan es facilitar el enrutamiento, controlar la calidad de la se\u00f1al y cumplir los l\u00edmites de coste.<\/p>\n\n\n\n

II. Planificaci\u00f3n de las capas de potencia y de tierra<\/h1>\n\n\n\n

A. C\u00f3mo elegir el n\u00famero de capas de potencia<\/h2>\n\n\n\n

El n\u00famero de planos de alimentaci\u00f3n viene determinado principalmente por los siguientes factores: cu\u00e1ntos ra\u00edles de alimentaci\u00f3n necesita la placa, c\u00f3mo est\u00e1n repartidos por la placa, cu\u00e1nta corriente debe transportar cada ra\u00edl, cu\u00e1les son los objetivos de rendimiento de la placa y los l\u00edmites de coste de una sola placa. Hay que elegir el n\u00famero de planos de alimentaci\u00f3n para que cada carril de alimentaci\u00f3n principal tenga un plano adecuado o un \u00e1rea de plano bien definida. Tambi\u00e9n debes asegurarte de que los planos de alimentaci\u00f3n no se solapan de forma que se produzcan interferencias o se creen planos divididos que perjudiquen el rendimiento.<\/p>\n\n\n\n

Hay dos reglas importantes para el dise\u00f1o del plano de potencia:<\/p>\n\n\n\n

Las redes de alimentaci\u00f3n no deben mezclarse en el mismo plano de forma que causen interferencias. En resumen, evite las redes de alimentaci\u00f3n intercaladas en un mismo plano f\u00edsico.<\/p>\n\n\n\n

Evite que las se\u00f1ales importantes atraviesen divisiones en planos adyacentes. Si una se\u00f1al debe cruzar una divisi\u00f3n, el plano de referencia de la se\u00f1al puede romperse. Esto rompe las v\u00edas de corriente de retorno y perjudica la integridad de la se\u00f1al. Por tanto, organice las pilas de planos de modo que las se\u00f1ales importantes no crucen divisiones.<\/p>\n\n\n\n

B. C\u00f3mo elegir el n\u00famero de capas de tierra<\/h2>\n\n\n\n

Cuando coloques capas de tierra, presta atenci\u00f3n a estos puntos:<\/p>\n\n\n\n

La capa situada justo debajo del lado del componente principal debe tener un plano de tierra casi continuo. Esto ayuda a devolver la corriente y reduce el ruido para las partes en el lado superior.<\/p>\n\n\n\n

Las se\u00f1ales de alta velocidad, las redes de alta frecuencia y las redes de reloj deben hacer referencia a un plano de tierra s\u00f3lido. Su corriente de retorno fluye por ese plano. Si el plano se rompe, las se\u00f1ales reciben ruido y EMI.<\/p>\n\n\n\n

Los planos de potencia principales y los planos de tierra deben estar cerca y bien acoplados. Un acoplamiento estrecho reduce la impedancia del plano y favorece la integridad de la alimentaci\u00f3n. La baja impedancia ayuda a mantener bajo el rizado y proporciona una alimentaci\u00f3n estable a los circuitos integrados.<\/p>\n\n\n\n

En la pr\u00e1ctica, un dise\u00f1o con muchas redes r\u00e1pidas necesitar\u00e1 m\u00e1s planos de tierra o, al menos, un par de planos de potencia y tierra cercanos entre s\u00ed. As\u00ed se consigue un mejor desacoplamiento y un control m\u00e1s sencillo de la impedancia.<\/p>\n\n\n\n

III. Planificaci\u00f3n del n\u00famero de capas de se\u00f1ales<\/h1>\n\n\n\n

A. Canales de enrutamiento y por qu\u00e9 son importantes<\/h2>\n\n\n\n

Los canales de enrutamiento suelen decidir cu\u00e1ntas capas de se\u00f1al se necesitan. Empiece por buscar BGA profundos o conectores grandes en la placa. La profundidad del BGA y el paso de los pines del BGA son clave para determinar cu\u00e1ntas capas de escape necesita. Por ejemplo, un BGA con paso de 1,0 mm suele permitir dos trazas entre dos v\u00edas. Un BGA con un paso de 0,8 mm a menudo s\u00f3lo permite una traza entre dos v\u00edas. Esa diferencia cambia el n\u00famero de capas de enrutamiento que debe tener.<\/p>\n\n\n\n

Si un BGA permite dos trazas entre dos v\u00edas, el escape BGA puede compartir dos capas de enrutamiento. Si un BGA s\u00f3lo permite una traza entre dos v\u00edas, el escape puede necesitar hasta cuatro capas de enrutamiento para enrutar todas las redes. Por tanto, el paso de la BGA y la geometr\u00eda del fanout son fundamentales para la planificaci\u00f3n de las capas.<\/p>\n\n\n\n

Los conectores son diferentes. En el caso de los conectores, el factor principal es la profundidad y la separaci\u00f3n entre patillas. Normalmente, entre dos v\u00edas de conector se encamina un par diferencial. Esta regla emp\u00edrica te ayudar\u00e1 a calcular cu\u00e1ntos canales necesitas para las regiones de conectores.<\/p>\n\n\n\n

B. Redes de alta velocidad y necesidades de canales de encaminamiento<\/h2>\n\n\n\n

A continuaci\u00f3n, considere alta velocidad<\/a> se\u00f1ales. El encaminamiento de alta velocidad requiere m\u00e1s condiciones. Hay que pensar en los stubs, el espaciado de las trazas y los planos de referencia. Las redes de alta velocidad son sensibles al control de la impedancia y a la corriente de retorno. Por lo tanto, comprueba si los canales de enrutamiento para esas redes son lo suficientemente anchos y despejados.<\/p>\n\n\n\n

Al planificar, identifique qu\u00e9 redes son de alta velocidad. D\u00e9les prioridad en el encaminamiento. Reserve canales que permitan un espaciado adecuado y una impedancia controlada. Tenga en cuenta tambi\u00e9n los pares diferenciales. Las l\u00edneas diferenciales necesitan longitudes adaptadas y un acoplamiento firme a su referencia. En el caso de los pares de alta velocidad, hay que mantener una distancia constante al plano de referencia y alejar los pares de redes ruidosas.<\/p>\n\n\n\n

C. Zonas estrechas o de embotellamiento<\/h2>\n\n\n\n

Por \u00faltimo, planifique las zonas de cuello de botella de la placa. Tras la planificaci\u00f3n b\u00e1sica de la colocaci\u00f3n y el encaminamiento global, busque regiones estrechas en las que muchas redes deban pasar por un peque\u00f1o hueco. Se trata de puntos de estrangulamiento. Para cada cuello de botella, cuente el n\u00famero de trazas, pares diferenciales y redes sensibles necesarios. A continuaci\u00f3n, decida el n\u00famero de capas necesarias para que todas las l\u00edneas requeridas puedan pasar por esta zona.<\/p>\n\n\n\n

Hazlo paso a paso:<\/p>\n\n\n\n

Marque la regi\u00f3n del cuello de botella.<\/p>\n\n\n\n

Enumera todas las redes que deben pasar por \u00e9l.<\/p>\n\n\n\n

Incluya en la lista los pares diferenciales y las se\u00f1ales cr\u00edticas.<\/p>\n\n\n\n

Calcula el n\u00famero de v\u00edas que caben por capa de encaminamiento en ese hueco.<\/p>\n\n\n\n

Multiplique por el n\u00famero de capas de enrutamiento que puede utilizar para esa zona.<\/p>\n\n\n\n

Esto da el n\u00famero total de v\u00edas que pueden pasar. Si ese n\u00famero es inferior al de redes necesarias, a\u00f1ade capas de enrutamiento o cambia la colocaci\u00f3n para reducir la congesti\u00f3n.<\/p>\n\n\n\n

IV. Ejemplos y reglas pr\u00e1cticas<\/h1>\n\n\n\n

A. Ejemplos de escapes BGA<\/h2>\n\n\n\n

Si puede enrutar dos trazas entre dos v\u00edas en un BGA, a menudo puede utilizar dos capas de enrutamiento para el escape del BGA. Este es un caso com\u00fan para los paquetes BGA de paso de 1,0 mm.<\/p>\n\n\n\n

Si s\u00f3lo puede enrutar una traza entre dos v\u00edas, es posible que necesite cuatro capas de enrutamiento para enrutar todos los pines BGA. Esto suele ocurrir con los BGA de paso m\u00e1s estrecho, como los de 0,8 mm.<\/p>\n\n\n\n

B. Ejemplo de enrutamiento de conectores<\/h2>\n\n\n\n

Para muchos conectores, suponga que puede enrutar un par diferencial por cada dos v\u00edas. Util\u00edcelo para dimensionar los canales de enrutamiento cerca del conector. Si el conector tiene muchas v\u00edas, necesitar\u00e1 m\u00e1s capas de enrutamiento o una huella de conector diferente.<\/p>\n\n\n\n

C. Ejemplo de se\u00f1al de alta velocidad<\/h2>\n\n\n\n

Para un par diferencial MIPI o USB, debe mantener el par cerca de su plano de referencia y mantener el espaciado del par y el ancho de la traza correctos para la impedancia objetivo. Si el canal de enrutamiento es estrecho, es posible que necesites m\u00e1s capas para mantener el dise\u00f1o limpio y cumplir los objetivos de impedancia.<\/p>\n\n\n\n

V. M\u00e1s sobre la planificaci\u00f3n de la integridad de la se\u00f1al y la fabricabilidad<\/h1>\n\n\n\n

A. Mantener la ruta de retorno corta y local<\/h2>\n\n\n\n

Planifique siempre las capas de se\u00f1al de forma que la corriente de retorno pueda fluir por un plano de tierra cercano. Cuando una capa de se\u00f1al est\u00e1 junto a un plano de tierra, la trayectoria de retorno es corta y la EMI es baja. Si coloca una capa de se\u00f1al entre dos planos mezclados o cerca de un plano dividido, la ruta de retorno no es local. Esto provoca m\u00e1s EMI y puede da\u00f1ar la integridad de la se\u00f1al.<\/p>\n\n\n\n

B. Cuidado con los planos divididos y las costuras<\/h2>\n\n\n\n

Si debe dividir un plano, dirija las se\u00f1ales sensibles de modo que no crucen la divisi\u00f3n. Si una red de alta velocidad debe cruzar una divisi\u00f3n de plano, proporcione una v\u00eda de retorno clara o una costura para mantener la coherencia de la ruta de retorno. Utilice cosidos de v\u00edas y v\u00edas de tierra cerca de los bordes de las divisiones para reducir el \u00e1rea de bucle.<\/p>\n\n\n\n

C. Mantenga los pares de potencia\/tierra cerca en el apilamiento<\/h2>\n\n\n\n

Cuando se coloca un plano de potencia junto a un plano de tierra, el par forma un condensador. Esto ayuda a desacoplar la potencia y reducir la impedancia del plano. Esto es muy \u00fatil para la integridad de la potencia. Si tienes varios carriles de alimentaci\u00f3n, intenta agruparlos en pilas emparejadas o utiliza planos divididos solo cuando controles el enrutamiento para evitar largos caminos de retorno.<\/p>\n\n\n\n

D. Considerar las normas de fabricabilidad desde el principio<\/h2>\n\n\n\n

Establezca los l\u00edmites DFM al inicio. Especifique la anchura m\u00ednima de la traza, la separaci\u00f3n m\u00ednima entre trazas, el anillo anular m\u00ednimo y el tama\u00f1o m\u00ednimo del taladro. Haga coincidir sus reglas de dise\u00f1o con lo que la f\u00e1brica puede hacer de forma fiable. Si planea trazas muy finas o v\u00edas muy peque\u00f1as, compruebe si el proveedor puede manejarlas y c\u00f3mo cambiar\u00e1 el coste.<\/p>\n\n\n\n

VI. C\u00e1lculo m\u00e1s detallado del cuello de botella<\/h1>\n\n\n\n

A. C\u00f3mo contar carriles en un hueco<\/h2>\n\n\n\n

Mida la anchura del hueco en la regi\u00f3n del cuello de botella.<\/p>\n\n\n\n

Utilice la anchura y el espaciado de traza previstos para calcular cu\u00e1ntas pistas de un solo extremo caben en una capa. Para pares diferenciales, cuenta cu\u00e1ntos pares caben en funci\u00f3n del paso del par.<\/p>\n\n\n\n

Tenga en cuenta las zonas de retenci\u00f3n y las v\u00edas que bloquean las pistas. Reduzca la anchura \u00fatil en funci\u00f3n del espacio ocupado por los campos de v\u00edas o los orificios mec\u00e1nicos.<\/p>\n\n\n\n

B. Decidir el recuento de capas a partir de la capacidad de huecos<\/h2>\n\n\n\n

Si una capa puede transportar las v\u00edas necesarias, no hay problema.<\/p>\n\n\n\n

Si no es as\u00ed, a\u00f1ada otra capa de enrutamiento y vuelva a comprobarlo.<\/p>\n\n\n\n

Si no es posible a\u00f1adir capas, considere la posibilidad de mover piezas, cambiar el conector o cambiar la estrategia de fanout BGA.<\/p>\n\n\n\n

VII. Ponerlo todo junto - flujo pr\u00e1ctico para la planificaci\u00f3n de capas<\/h1>\n\n\n\n

Etapa 1 Enumerar las limitaciones y los objetivos<\/p>\n\n\n\n

Haz una lista corta: n\u00famero de BGAs y su paso, n\u00famero de conectores, n\u00famero de redes de alta velocidad, lista de carriles de alimentaci\u00f3n, objetivos de rendimiento y objetivo de coste.<\/p>\n\n\n\n

Paso 2. Esbozar un apilamiento preliminar<\/p>\n\n\n\n

Empieza con los planos de potencia y tierra necesarios cerca del centro. Coloca capas de se\u00f1al a su alrededor. Utiliza pares de alimentaci\u00f3n\/tierra donde necesites baja impedancia.<\/p>\n\n\n\n

Paso 3. Compruebe las necesidades de escape de BGA<\/p>\n\n\n\n

Compruebe cada BGA. Si necesita m\u00e1s v\u00edas de escape, a\u00f1ada capas de se\u00f1al o cambie la huella de la BGA.<\/p>\n\n\n\n

Paso 4. Comprobar los canales de enrutamiento de alta velocidad<\/p>\n\n\n\n

Marque todas las redes de alta velocidad. Res\u00e9rveles canales de enrutamiento. Si los canales son estrechos, a\u00f1ada capas o cambie la colocaci\u00f3n.<\/p>\n\n\n\n

Paso 5. Comprobar los cuellos de botella<\/p>\n\n\n\n

Cuenta la capacidad de cada hueco estrecho. Si la capacidad no es suficiente, a\u00f1ade capas o mueve cosas.<\/p>\n\n\n\n

Etapa 6. Finalizar el apilamiento y las reglas<\/p>\n\n\n\n

Arregla el apilamiento. Establece la anchura de las trazas, el espaciado y los objetivos de impedancia. Aseg\u00farate de que el dise\u00f1o se ajusta a DFM.<\/p>\n\n\n\n

Paso 7. Validaci\u00f3n con los ingenieros y el fabricante<\/p>\n\n\n\n

Revise el apilamiento con el fabricante de la placa de circuito impreso y con los ingenieros de integridad de la se\u00f1al. Solicite comentarios y ajustes.<\/p>\n\n\n\n

VIII. Breve resumen<\/h1>\n\n\n\n

La planificaci\u00f3n de capas es una mezcla de necesidades el\u00e9ctricas y enrutamiento pr\u00e1ctico. Se planifican las capas de potencia y tierra para que la potencia sea estable y las v\u00edas de retorno cortas. Las capas de se\u00f1al se planifican en funci\u00f3n de los canales de enrutamiento, el paso de BGA, la profundidad del conector y las zonas de cuello de botella. Si se planifica bien, el encaminamiento ser\u00e1 m\u00e1s f\u00e1cil y fiable. Desde un punto de vista sencillo, el dise\u00f1o de PCB es como construir un edificio alto. El plano de capas es el dibujo. Si el dibujo es correcto, la construcci\u00f3n va sobre ruedas.<\/p>\n\n\n

\t\t\t\n\t\t\t\t\t\t\t\t<\/path><\/svg>\n\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<\/path><\/svg>\n\t\t\t\t\t\t\t<\/span>\n\t\t\t\u00bfC\u00f3mo se determina el n\u00famero de capas de la placa de circuito impreso?<\/span><\/div>

El n\u00famero de capas de la placa de circuito impreso viene determinado por el n\u00famero de capas de se\u00f1al y el n\u00famero de planos de potencia y tierra necesarios para el circuito. Los ingenieros eval\u00faan la densidad de componentes, la complejidad del enrutamiento, el paso de BGA, las se\u00f1ales de alta velocidad y las necesidades de distribuci\u00f3n de energ\u00eda antes de decidir el n\u00famero final de capas.<\/p><\/div><\/div>

\t\t\t\n\t\t\t\t\t\t\t\t<\/path><\/svg>\n\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<\/path><\/svg>\n\t\t\t\t\t\t\t<\/span>\n\t\t\t\u00bfPor qu\u00e9 son importantes los planos de tierra en el dise\u00f1o de placas de circuito impreso?<\/span><\/div>

Los planos de tierra proporcionan una referencia estable para las se\u00f1ales y ayudan a reducir las interferencias electromagn\u00e9ticas. Un plano de tierra continuo tambi\u00e9n mejora la integridad de la se\u00f1al y proporciona una v\u00eda de retorno clara para las se\u00f1ales de alta velocidad.<\/p><\/div><\/div>

\t\t\t\n\t\t\t\t\t\t\t\t<\/path><\/svg>\n\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<\/path><\/svg>\n\t\t\t\t\t\t\t<\/span>\n\t\t\t\u00bfC\u00f3mo afectan los BGA a la planificaci\u00f3n de capas de PCB?<\/span><\/div>

Los BGA tienen una densa disposici\u00f3n de pines. El paso del BGA determina cu\u00e1ntas trazas pueden pasar entre las v\u00edas. Un paso m\u00e1s grande permite m\u00e1s canales de enrutamiento, mientras que un paso m\u00e1s peque\u00f1o requiere m\u00e1s capas de enrutamiento para completar el enrutamiento de escape de se\u00f1al.<\/p><\/div><\/div><\/div>\n\n\n

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I. Overview of PCB Layer Count Determination The total number of PCB layers is not fixed at the start. 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