Application
Transimpedance amplifiers are commonly used in receivers for optical communications. The current generated by a photodetector generates photo voltage, but in a nonlinear fashion. Therefore the amplifier has to prevent any large voltage by its low input impedance and generate either a 50 Ohm signal to drive a coaxial cable or a voltage signal for further amplification. Note that the most linear amplification is current amplification by a bipolar transistor, so you may want to amplify before the impedance conversion.
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—Ralph Waldo Emerson (1803–1882)
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