transimpedence-amplifier

I'm using LTC6268-10 to build a ~200MHz TIA (Transimpedance amplifier) Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/626810f.pdf Here is the schematic: The frequency response I get: I expect the bandwidth to only roll off at 250MHz, why does it fall to -3dB...

Hello, I am new to hardware design. I am designing measurement circuit for Impedance Spectroscopy of electrochemistry cell. I need to measure the current coming from electrodes which have range from few milliamperes to few nanoamperes. as literature suggested, the equivalent circuit for...