I am trying to understand the circuit shown above, with one JFET transistor at left side acting a current buffer and right hand side with a op amp.
this is a low noise transimpedance circuit, which I think I can use or modified this circuit and used in my design, sensitive to noise and a current signal needed to be amplified to voltage signal in the end.
the problem is that I am not quit sure how to analyse the circuit, should I use small-signal analysis? Do I need to derive the transfer function?
why the Bandwidth is 2MHZ and where is the cut off frequency? and is the system stable or not?
Can someone give me a clue or answer, please?