So I have made a low pass filter and plotted the transfer function of it. However, I know I need to also use another opamp to correct the phase shifting/ gain. What design should be best to add on to the output so that it doesn't invert or change the transfer function, just shift it vertically? I have tried inverting and non inverting but both flip by graph. Help please?!?
EDIT: This is what I tried, but it didn't just simply shift the graph (phase shift) but flipped it.