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Purpose of low pass filter on LTC2054 Amplifier

Question asked by schulz1701 on Apr 23, 2018
Latest reply on Apr 24, 2018 by KaungWin

Hello all,

 

I am working on a design using the LTC2054 op-amp, I am planning on using this device to amplify a photodiode, on page 16 of the datasheet for the 2054, they list and example circuit for exactly this purpose, which consists of what looks basically to be a standard low pass active filter (With a very slight modification to the feedback path), they state that this configuration should have a bandwidth of 10Hz, which upon simulation, it does. So I cannot seem to figure out why there is a ~8kHz low pass on the filter on the output of what is basically a 10Hz low pass active filter.

 

Any insight would be helpful,

cheers!

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