TIA Input Z: Infinite… or Zero? What is it, really?

What is the input impedance of a transimpedance amplifier (TIA)? Infinite?  Zero?  No, what is it really? Nothing is really zero or infinite, right? The answer might surprise you—worth understanding, even if you don’t use TIAs. After all, an inverting amplifier is just a TIA with an input resistor, right?

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