Part Number: LMH6552
Hi,
I am designing a prototype that works with differential signals. This signal passes through several components, and after an FDA driver implemented with the LMH6552, it needs to be fed into a band-pass filter, such as the one generated using the FilterPro tool:
The attached BPF is a 4th-order Butterworth filter using an MFB topology. As shown in the schematic, the positive output “out+” of the first FDA (node A) feeds the negative input of the second FDA. My understanding is that this introduces a 180-degree inversion in the differential polarity.
Given that, how should I connect the polarity of my differential signal to the filter inputs Vin1 and Vin2? Should I connect the positive output of my FDA to Vin1 to obtain an overall 360-degree phase relationship? Or should I instead connect the positive output to Vin2 and the negative output to Vin1?
