Diferencia entre dB y dBm

: 23 de enero de 2022

dB generalmente se asocia con la medición de ondas de sonido, sin embargo, su uso se extiende al campo de la ingeniería, donde se usa principalmente para calcular la relación entre los niveles de potencia en dos puntos distintos en redes ópticas y cables.

dBm es la medida absoluta de la intensidad de potencia en solo un punto. No tiene en cuenta la diferencia de señal o potencia en la red general.

dB vs dBm

La principal diferencia entre dB y dBm es que dB se usa para connotar una diferencia relativa en potencia, voltaje, corriente o intensidad de señal entre dos puntos. dBm se usa para denotar la medición absoluta de potencia o señal en un punto dado en un cable.

dB representa esencialmente una relación entre las mediciones del valor en dos puntos dados. dBm es la medición de potencia en un punto en decibelios referenciados contra un milivatio ( mW ).

Tabla de comparación entre dB y dBm

Parámetros de comparación dB , o la intensidad de la señal entre dos puntos en un cable o red. dBm se usa para medir la intensidad de una señal en un punto dado en el cable o la red. Forma completa La abreviatura dB significa Decibelios. La abreviatura dBm significa Decibel Milliwatts. Punto de referencia Un dB se mide contra la entrada de potencia de un cable óptico. Un dBm se mide contra un milivatio. La naturaleza de la unidad de medida dB es un pariente, unidad de medida adimensional ya que connota una relación entre dos valores 2.dBm es una medida absoluta de la intensidad de la señal en un punto particular. Usos en una red de fibra óptica dB se utiliza para connotar la pérdida óptica en una red de fibra óptica. dBm se utiliza para connotar la potencia óptica en una red de fibra óptica.

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¿Qué es dB?

dB es la abreviatura utilizada para referirse a decibelios. Es una relación logarítmica entre los dos valores de intensidad de potencia medidos en dos puntos diferentes en un cable, cable o red. Como unidad adimensional, dB es un valor relativo. Esta unidad de medida generalmente está asociada con la medición del sonido. Sin embargo, también se usa para calcular la intensidad de la potencia, las señales y la corriente.

El valor de utilidad de este sistema de medición se almacena en su capacidad para facilitar la reducción conveniente de valores grandes – al convertir los valores en en relación en enteros manejables. Esto ayuda a facilitar los cálculos para ingenieros y científicos.

dB es una unidad útil en la medición del aumento o disminución de la intensidad de la señal entre dos puntos en un sistema amplificador. Esto lo convierte en un sistema de medición aceptado en la disciplina de la electrónica acústica.

La fórmula para calcular 1 dB es la siguiente:

1 dB = 10 log ( P1 / P2 ) <TAG1

Donde P1 es la intensidad de potencia en el primer punto y P2 es la intensidad de potencia en el segundo punto.

¿Qué es dBm?

dBm es la abreviatura utilizada para connotar Decibel Milliwatts. Es la medida absoluta de potencia en un punto dado en el cable o la red. Estrechamente relacionado con dB, dBm mide la potencia en un punto dado en referencia con un milivatio. dBm se calcula como diez veces el registro de la intensidad de la señal en milivatios.

Denota la cantidad de potencia que una antena puede producir en cualquier punto dado. dBm también se usa en el estudio de señales ópticas. Se utiliza para definir la intensidad de la señal en varios equipos electrónicos como cables, cables, amplificadores de señal, etc. Una señal fuerte de un amplificador oscilará alrededor de 70 dBm o más, mientras que una señal más débil tendrá alrededor de 100 dBm o menos.

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También se utiliza en el estudio de redes de fibra óptica. dBm generalmente se usa para medir la potencia óptica en términos absolutos. Por lo tanto, dBm puede clasificarse como otra unidad de poder que expresa la intensidad del valor de potencia absoluta en un punto en milivatios.

La fórmula para calcular 1 dBm es la siguiente:

1 dBm = 10 * log ( P / 1mW ) <TAG1

Donde P representa potencia en vatios.

Diferencias principales entre dB y dBm

  1. La principal diferencia entre dB y dBm es que el primero se define como la diferencia en la potencia o la intensidad de la señal entre dos puntos dados, mientras que este último se define como el valor absoluto o la intensidad de la potencia. Este último se usa para determinar la intensidad de la señal en un punto particular.
  2. La forma completa de cada uno es diferente. La abreviatura dB significa Decibels, mientras que dBm es la abreviatura comúnmente utilizada para Decibel Milliwatts.
  3. La potencia absoluta o el nivel de señal indicado por dBm se hace referencia a 1 milivatio. Por otro lado, las mediciones de dB no corresponden a 1 milivatio. Los valores de dB para un cable óptico dado se refieren a la potencia de la entrada total en la red.
  4. A diferencia de dB, dBm es una unidad de medida absoluta. El primero representa un número relativo que connota el aumento o la disminución de la intensidad de la señal. Sin embargo, este último connota la medida absoluta de la intensidad de la señal en un punto dado.
  5. La función de dB y dBm es diferente en una red de fibra óptica. En una red de fibra óptica, la potencia óptica tiende a medirse por la unidad de medida dBm, mientras que la pérdida óptica se mide utilizando el sistema de medición de relación dB.
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Síntesis

dB y dBm son conceptos interrelacionados. Ambos conceptos son centrales para ecuaciones y cálculos en el campo de la ciencia, la ingeniería y la señalización óptica. Sin embargo, existen diferencias minúsculas entre los dos.

Una evaluación cercana de los conceptos revela que dB es una medida de relación. Es una medida adimensional de la diferencia en la intensidad de potencia entre dos puntos dados en una red, cable o cable. Mientras que dBm representa un valor absoluto y directo que denota la intensidad de la potencia en un punto único en la red o el cable.

dBm mide la potencia con una referencia a milivatios, mientras que dB lo mide simplemente como una relación sin asociar el cálculo con ninguna otra unidad de potencia. Además, los usos de cada concepto también son un poco diferentes, aunque ambos se usan en las mismas disciplinas.

  1. https://ieeexplore.ieee.org/abstract/document/6222357/

Contenido

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