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Transimpedance amplifier

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MuhaCircuits123

Joined Sep 30, 2024
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I found this circuit in notes of an older college. Can somebody please explain me why this additional diode is used? What exactly do feedback resistors 100kOhm and 3Mohm do? What is the purpose of bjt transistor? As you can see I understand very little about this circuit. Notes said that circuit is used for high bandwidth purpose.
 
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