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Laser Range Finding

João Rego
Intellectual 286 points

Hello,

I would like to have more information about your products for laser range finding using the time of flight method. Although this is similar to LIDAR, I have some remarks.

The system is composed of a transmitter and a receiver. The transmitter will have a gate driver for MOSFET or GaN in order to increase the current applied to the gate. This driver has to be the fastest possible since we want to produce laser pulses below 25ns. The MOSFET or GaN is connected to a laser, which will send the beam. On the receiver, the system has an APD and its current has to be amplified with a gain of 200kOhm. I thought about using a TIA and FDA. After the signal is amplified, the system has an ADC. This ADC has to be fast enough to read the measurements and it doesn't have to be very accurate.

So, I would want technical support on the choice of an adequate gate driver, of a proper amplification circuit with a gain of 200kOhm, and a good ADC for this system.

Thank you in advance.

  • +1
    TI__Mastermind 23045 points

    Hello Joao,

    Thanks for posting to the sensors forum! Lots of information to go through here, but we have a reference design for a LIDAR ToF system which you can look at here: www.ti.com/lit/ug/tiducm1b/tiducm1b.pdf 

    This may be a good place to start but my recommendation would be to make a forum post specifically regarding each items of interest such as the gate driver, AFE circuit, and the ADC in order to get the engineers familiar with those parts to recommend the most suitable parts for your system.

    The document I referenced has some components listed already so those may be a good starting point to get the conversation started. If you have any specific requirements make sure to list those in your question.

    I hope this helps!

    Best,

    Isaac