I am trying to understand the circuit in this publication. The picture below is the simplification of the circuit. I do not understand the role of the cascode configuration part of the circuit. Appreciate any inputs or reference to other publications that similar with this.
From the paper, the whole circuit is a transimpedance amplifier which is based on a capacitive feedback current amplifier. The output current is dumped into the load resistor to get the output voltage which is later buffered.
There is other circuit which I think is similiar, but using single ended opamp here. Here is the picture.