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PIN photodiode & TIA question

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I have an article on my web site that has this, with detailed design steps.

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about halfway down.

Cheers,

Phil Hobbs

Reply to
Phil Hobbs
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Hi everybody.

I am going to use S7481 photodiode as high speed photodetector for 100Mbit/s free space optical link. It is high speed photodiode (Cut-off frequency 500MHz) with high sensitivity in visible range

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but it has high junction capacitance - 6pF. I have MAX3657 transimpedance amplifier (TIA)
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But it optimized for 0.5pF capacitance photodiodes. For 0.5pF MAX3657 has

130MHz signal bandwidth, for 1.5pF bandwidth is 50MHz. It less than 75Mhz, needed for 100Mbit/s. Not only bandwidth decreased, input referred noise level increase also.

Can I loss sensitivity but reach 75Mhz bandwidth on S7481 + MAX3657? Or I need other solution ? What would you recommend ?

-- with best regards Roman

Reply to
Roman D. Sinjuk

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