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THS4500: Fully Differential Butterworth lowpass filter

Part Number: THS4500
Other Parts Discussed in Thread: THS4561, THP210, OPA1637

We are looking for a tool that allow us to develope a fully differential 4º order low-pass butterworth filter but FilterPro doesn´t allow it.

I´ve written in the chat (CS1413091) and  I`ve been redirected to this forum.

We need a 1.8KHz bandpass with a 0.01db ripple and a 40db attenuation over 14.34kHz. Our design can be checked in the pictures. Dual power supply. VDD:+-3v3, G=1