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LMG1020: LMG1020EVM-006

Monica Rodriguez Cortina
Prodigy 20 points
Part Number: LMG1020

Hello,

I generate two equal square signals with a period of 1 us (duty cycle = 50%), with a delay between them of 10 ns. These signals are created through an FPGA

One signal is introduced in IN + and another in IN-. Is the signal created at the output a pulse of 10 ns with a period of 1 us?


My diode laser has a operating Current of 200 mA and threshold current 70 mA.

Thus,  I increase the value of voltage in "DC Input supply" until obtaining 200 mA and also increase the value of voltage in "DC bias supply" until obtaining 70 mA in the evaluation module, is the procedure correct?

Best regards,

Mónica

  • 0
    TI__Expert 3225 points

    Hi Monica,

    Could you please let me know what threshold current means?

    1. You are right. You will get 10 ns pulse with 1 us period.

    2. The DC bias voltage is always fixed. This will supply the 5V to the LMG1020 IC. To have the laser diode fired up with the current you desire, you can just increase DC input supply. This increase on the voltage will increase the di/dt on your laser diode and finally help to achieve the current you need.

    Thanks,

    Lixing

  • 0 in reply to Lixing Fu
    Prodigy 20 points

    Hi Lixing,

    Thanks you for your answer.

    The threshold current is the minimum current needed to sustain Laser action in a Diode laser. My diode laser is 70 mA.

    Best regards,

    Mónica

  • 0 in reply to Monica Rodriguez Cortina
    TI__Expert 3225 points
    Hi Monica,

    No problem. Thanks for letting me know. This current is only related to the behavior of your laser diode, but does not affect the circuit operation as what I have explained above. Please let me know if you still have any questions. Good luck to your design.

    Thanks,
    Lixing