I am doing literature research about Transimpedance Amplifier (TIA) architecture and designs. What I know for sure are its input is current, its output is voltage and it has low input and output impedance.

But I found some publications that use OTA+Resistive feedback to form a TIA. It makes me question some fundamentals understanding that I have so far.

OTA+Resistive feedback


  1. Is the topology like this VCVS(Opamp) or VCCS(OTA)? There is this discussion as well but it did not give a conclusion.

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Razavi also referred the following Cascode Op Amp circuit as OTA. enter image description here enter image description here

  1. If I have Current Amp and I dump this current into a resistor, does it make the circuit to become TIA? I do not think so, because we need to consider the impedance also at the input and output port.


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