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TIA LTC6268-10 input overdrive - this is bad?

Question asked by kotkrinik on Dec 14, 2017
Latest reply on Dec 28, 2017 by shyam.sunder91

Hello everybody! I'm developing an optical receiver based on an avalanche photodiode. As a transimpedance amplifier I want to use the LTC6268-10 chip. The power range of the signal I receive is quite large, from 40 nA to 15 mA. The planned transimpedance is 400 kOhm. This will provide an acceptable bandwidth with a good gain of 40 nA signal. But the next question arises. What will happen with LTC6268-10 in cases where the input is overdriven and the output is overloaded? At currents of tens of μA at the input of TIA, the spice model LTC6268-10 goes into saturation. How will the real chip behave? Will not it break down? Is it necessary to somehow deal with the overdrive of the input or I can leave everything as is? I'm only interested in the leading edge of the signal, so that the extension of the signal at the output is not a problem for me.

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