I was wondering how to experimentally measure the TI gain of a TIA using a VNA. Usually VNA provides S-parameters which is voltage ratio. But how can we get/derive a measurement that is the ratio of Voltage/current?
Does having a photodiode connected to TIA help in converting the applied voltage signal from a signal generator (power signal+50 ohm termination) imitate a current source? Can we perform the measurement without a photodiode at all? Any help is greatly appreciated.
It's a question of impedance. Typically the VNA is a matched 50 Ohm system, so if you were to assume your circuit is matched, the current in would correspond to the voltage across a 50 Ohm load. Chances are our system isn't 50 Ohms though, so you'd have to deal with appropriate impedance transforms and/or mismatch.
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