Non Inverting Operational Amplifier?

If Cg is the capacitor in series, gain = 1 + Rf/[Rg + 1/(jqCg)]. Simplify this to get gain at dc = 1, gain at freq>> fH is 1+Rf/Rg. Note fh = 1/(2.pi.CgRg). gain increases after fl = 1/ {2.pi.(Rg+Rf)Cg}