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How to chop dc signal (current of 2mA from photodiode)

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praveenmogre

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Hi everyone iam working on photodiode and iam having 2mA constant DC signal from it. but i want to chop the signal at 1MHz frequency so that i get discontinous pulses ,please can someone help me designing circuit?
 

We can't know where your photocurrent / DC signal is referred to: GND-referred, VDD-referenced - or someway between?

You'd better show your design.
 

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