I got problem when getting the noise density plot on OPA132 with PSPICE simulation. The circuit set up and noise plot is as attached.
There's a rise on 35~40Mhz (OPA132_CIRCUIT.JPG and OPA132_NOISE_PLOT.JPG) . Is that because of the inherent behavior of the OPAmp? It is hard to remove it even I build it to be sallen key filter (cut-off ~100Khz) as attached (OPA132_100K_FILTER_CIRCUIT.JPG and OPA132_100K_FILTER_NOISE_PLOT.JPG).