Discussion
Which topology converts a current into a voltage?
Answer: D
Voltage shunt feedback lowers both impedances: low at the input so it accepts a current with negligible voltage, and low at the output so it delivers a voltage regardless of load. That is the transimpedance amplifier, and it is how a photodiode's current is turned into a usable voltage. Reading the two words as instructions - sample the voltage, return in shunt - gives both impedance effects without any memorisation. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.
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