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WEBENCH® Tools/LOWPASSFILTER-CALC: Amplifier selection error in WEBENCH


Tool/software: WEBENCH® Design Tools


I was trying to design a low pass filter (5th order Butterworth using Sallen-Key at cut-off frequency of 500 kHz) in WEBENCH designer, and I want to develop the real circuit and create the BOM based on the output. However, I always get the following message:

"Amplifier bandwidth requirements are higher than available amplifiers. Ideal has been assigned to allow Spice simulations."

The highest required gain bandwidth stated in schematic section is actually only 81 MHz which is not the problem at all (as you can see in the following figure). 

Thank you for your support.

Best regards,