![]() A bare resistor as a current-to-voltage device will have low frequency bandwidth if there’s significant input capacitance, which there often is.an ordinary, real impedance) converts a current to a voltage drop, so why do we need to build an amplifier circuit to accomplish the same thing? Two answers: Ohm’s Law tells us that a simple resistor (i.e. This makes it useful to be able to convert a current to a voltage drop. Our previous op-amp circuits have used voltage as a signal, but many real-world sensors like photodiodes are physically based on perceiving changes in current, not voltage. It's also a common building block that helps explain the performance and stability limits of many other op-amp circuits. A transimpedance amplifier (TIA) converts a current to a voltage and is often used with current-based sensors like photodiodes.
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