Current feedback amplifier input structure
I don't understand your question. 
Are you talking about CFA topology by itself or you want to analyze the CFA used in a specific circuit configuration?   

Notice that in classic VFA amplifier when we are using it as inverting amplifier. We have a "virtual short", so we can treat the op-amp and RF resistor as a transimpedance amplifier and R1 resistor as a voltage to current converter. 

Also, do you consider this circuit as a CFA amplifier also? 







simulate this circuit &ndash; Schematic created using CircuitLab

Because this circuit also will have a low input resistance at inverting input. 

And when we are looking at the circuit from a classical defined a feedback theory point of view. The topology of this circuit is a voltage-series feedback amplifier (series-shunt). 







simulate this circuit

The only difference is the complementary circuit working in AB class. 
And I suspect that your circuit is called a CFA because of the fact that the "error" current at the input stage is mirrored and further processed by the circuit.