I have a question regarding to the OPA657 noise from TINA device model. Attached is the schematic and the output noise plot of the circuit from the simulation. the approximation I did is to measure the noise 41nv at 1MHz 3db increase (84nv) is then close to 100MHz. but based on the formula the zero is 1/(2PI*Rf*Cs). The input capacitance of opa657 will be less than 2pf. The data sheet shows 5.6pf. I also notice subcircuit inside of opa657 is opa277. Anything wrong on my thinking.