El circuito presentado es sugerido por Maxim (www.maxim-ic.com) consistente en una fuente de alimentación de muy bajo ruido, bajo ondulación para amplificadores, micrófonos, amplificadores para auriculares, CODEC y circuitos de audio especialmente sensibles a los ruidos del circuito .

El circuito de la figura 1 reduce la tensión de ruido y la ondulación en 40 dB para frecuencias entre 100 Hz y 20 kHz, que corresponde justamente a la pista de audio.

Con esto es posible suministrar una tensión limpia de 5 V para alimentar circuitos de audio en aplicaciones portátiles como celulares, reproductores MP3, notebooks, PDAs, etc.

La mayoría de los regulados de tensión lineal rechaza el ruido sólo hasta 1000 Hz, o cerca de eso, lo que significa que agregar un filtro adicional no algo bien visto en proyectos que son críticos en cuanto al espacio disponible.

La configuración sugerida acepta un Vcc ruidoso en el rango de 4,5 V a 6 V y produce Vcc en un nivel 7% más bajo. Por ejemplo, el circuito proporcionará 4,65 V bajo 1 A con una tensión de entrada nominal de 5 V y sólo 200 uA de corriente quiescente.

El diseño es muy pequeño, ya que se utiliza un transistor SOT23, un amplificador operacional en envoltura SO-8 y algunos componentes pasivos. El mayor componente es el capacitor de 10 uF. Los resistores son de 0,1 W para montaje en superficie.

En funcionamiento, el circuito funciona como un seguidor de tensión de banda ancha bufferizado donde el nivel de salida 7% más bajo que la tensión de entrada es fijado.

R1 y R3 forman un divisor de tensión que proporciona ese 7% de atenuación y C4 ayuda a formar un filtro en el 93% de la tensión.

La pequeña corriente de polarización de entrada del amplificador operacional (25 nA tip) permite el uso de valores elevados de resistores para R1 y R3 y además limita el máximo error DC en apenas 20 mV.

El resultado es un filtro paso bajo con corte en 2 kHz y que proporciona 20 dB de atenuación a 20 kHz.

Como la banda de entrada del amplificador en el modo en que se extiende ppr toda banda de alimentación (rail-to-rail) la entrada puede muestrear la tensión de entrada directamente. La alimentación del circuito se filtra por R2 y C5.

Estos componentes proporcionan una impedancia de salida más baja y un mejor rechazo de fuente para el amplificador operacional en las frecuencias más altas.

Este filtro tiene un rolloff de 300 Hz que aumenta el PSSRR del amplificador operacional (aún grande en 110 dB).

 


 

 

 

 

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