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TIDM-TIA: TIA

Emil Agayev
Prodigy 40 points
Part Number: TIDM-TIA
Other Parts Discussed in Thread: MSPM0G3507, OPA380

Tool/software:

Hello everyone. I am building a tia amplifier for receiving ultra-long-range reflected surface-modulated laser beams. Modulation is a 40khz sine wave. Laser diode is 650nm, 100mW. Please suggest some tia chip from your products.

  • 0
    TI__Mastermind 20747 points

    Not sure the details about this application (receiving ultra-long-range reflected surface-modulated laser beams)

    Can you tell me what's key specification that you need from an MCU?

    Now, we recommend you to use MSPM0G3507, there are OPA in it.

    https://www.ti.com/product/MSPM0G3507

    https://www.ti.com/tool/LP-MSPM0G3507

  • 0 in reply to Helic Chi
    Prodigy 40 points

    Hi, Thanks for the quick reply. I wrote my question through Google translator and it translated some words incorrectly and you misunderstood me. I need a selection of Transimpedance amplifier. I assembled a two-stage ^TIA amplifier on OPA380 and it works as I intended, but I want to achieve maximum range, so I need a chip that will receive very weak beams of a laser diode. My project is laser navigation.

  • 0 in reply to Emil Agayev
    TI__Mastermind 20747 points

    So, is this not related to a microcontroller?
    It's related to OPA part number selection, right?

  • 0 in reply to Helic Chi
    Prodigy 40 points

    This is related to opa.

  • 0 in reply to Emil Agayev
    TI__Mastermind 20747 points

    Here is MSP team, related to microcontroller.

    I will send this ticket to OPA team, please wait patiently for a reply.

  • 0 in reply to Emil Agayev
    TI__Mastermind 26460 points

    Sorry Emil

    I am not familiar enough with your system needs.  I would need more help understanding the input current in order to recommend an amplifier.  Are you saying the signal is a current that is modulated at 40kHz but what sort of amplitude, do you have any characteristics of the input source you can share such as output capacitance, and what supplies are available in your system.

    Chuck

  • 0 in reply to Chuck Sins
    Prodigy 40 points

    The amplitude can be different and it will change with distance. We will receive reflected laser beams and therefore the amplitude is always different. The signal source is a 100 mW 650 nm laser diode. The signal laser beam is modulated by a sinusoid at a frequency of 40 kHz. At first, a PDA5927 photodiode will be used, but after receiving good results, an AD500-8 avalanche photodiode will be used. At the moment, I have built a TIA amplifier on the OPA380. The circuit is two-stage with a common RF resistor and a bootstrap on the BF862 transistor at the input. At the moment, the result is as follows: a low-power 5 mm LED emits a 40 kHz sinusoid signal, the LED is directed at the wall, the TIA receives the reflected signal from the wall at a distance of 2 meters. The oscilloscope shows a pure 40 kHz sine wave signal, 120 mV amplitude. At this stage, lenses and optics are not used. There is no CF capacitor. I understand that a LED is not a laser and the spectrum is different, but this is still an experimental option. But I do not know whether this result can be considered good or not and I would like to achieve an even better result in terms of range.