Discussion
Why does a photodiode's capacitance limit a receiver's bandwidth?
Answer: C
The diode's capacitance sits at the summing node, so it works against the feedback resistance to set the dominant pole - which is why receivers use small-area diodes and reverse bias them hard to reduce it. It does not reduce the photocurrent, is at the input rather than the output, and affects noise through a separate mechanism. That the detector rather than the amplifier often sets the speed is worth knowing before a faster amplifier is specified.
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