El circuito mostrado en la figura 1 consiste en un oscilador por desplazamiento de fase usando un amplificador operacional. Este circuito es sugerido por Texas Instruments (www.ti.com) en su aplicación de referencia sobre el proyecto de osciladores con estos componentes.

 


 

 

Para los valores utilizados en el circuito, la frecuencia de la señal generada estará alrededor de 3,76 kHz. Se observa que la red RC de resistores es que determina esa frecuencia y que debe proporcional un desplazamiento de fase de 60 grados por rama lo que da un total de 180 grados, la necesaria inversión para el mantenimiento de las oscilaciones. La polarización de 2,5 V en la entrada no inversora puede ser obtenida por un divisor resistivo, siendo justamente la mitad de la tensión de la fuente de alimentación que no necesita ser simétrica en este caso. Una versión "bufferizada" del mismo circuito se muestra en la figura 2.

 


 

 

El circuito presentado en la figura 2 oscila en aproximadamente 2,9 kHz con los valores de los componentes indicados, teniendo una ganancia de aproximadamente 8. Observe que los dos circuitos producen señales senoidales, cuya amplitud está cerca de la tensión de alimentación usada.

 

 

 

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