El amplificador mostrado en la figura está indicado para operación con transductores resistivos como sensores de presión, temperatura o luz. Este circuito, como los demás se basan en un amplificador operacional de características excepcionales de National, que es el LM10. Este amplificador operacional puede operar con tensiones a partir de sólo 1,1 V. El LM10 utiliza transistores PNP en la entrada con una ganancia de 100 veces con una corriente de sólo 1 uA, ya que este tipo de componente permite una adaptación mejor que cuando se utiliza transistores NPN. Este amplificador es básicamente indicado para operar como comparador, pero su configuración en aplicaciones que requieren la operación lineal también es posible. En esta modalidad se destacan los amplificadores remotos en que la alimentación del propio operacional puede ser hecha por el cable de señal, como ocurre en este caso. El uso de amplificadores en la fuente de señal y no a su llegada elimina los problemas de capacitancia, inductancia, ruidos, además de otros que pueden degradar la calidad de la señal y afectar la precisión del sistema. Los resistores R1 y R2 dependen tanto de las características del sensor y de la ganancia deseada. Así, R1 debe tener el mismo orden de magnitud del sensor en su condición de centro de escala. El resistor R2, por otro lado, debe tener valores que junto con R1 van a determinar la ganancia del circuito. La resistencia de carga depende del circuito de interfaz. Observe que este circuito puede ser usado para monitorear un sensor remoto a través de cable trenzado con la alimentación hecha del lado del receptor.

 


 

 

 

18.841MBMemory Usage39.66msRequest Duration
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PHP Version8.3.20
Identityguest
Response200
Templatecassiopeia
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