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How does current and voltage of laser diode behave in relation to control voltage?

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Siniša

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I need help in analyzing this circuit. I need to find how does current and voltage of laser diode behave in relation to control voltage. Output is driven with NPN in emmiter follower mode and AC feedback are not shown in circuit for simplicity. I understand that this circuit does not work as classic difference amplifier and is deliberately set to produce some effect desired for driving laser diode, but I am not sure what?
 

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