biff44
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Hi,
I don't know what you want me to explain.
A capacitor, a scope probe, a TIA, why a TIA improves fall time?
Everything already is explained. Do a forum search, do an internet search first.
If then still are questions you are welcome to ask a detailed question. Please refer to documents you have read, so we can discuss about it.
Klaus
Op-Amp Transimpedance Amplifier
A transimpedance amplifier (TIA) converts a current to a voltage and is often used with current-based sensors like photodiodes. It’s also a common building block that helps explain the performance and stability limits of many other op-amp circuits.
ultimateelectronicsbook.com
the input impedance of a transimpedance amplifier is NOT zero at high frequencies. so, where exactly do you expect that stored charge in the photodetector to go? to Disney world?