Other Parts Discussed in Thread: TINA-TI, OPA858, LM158, TLV3501, OPA836, LM7171, LM6171
My team is still working on this particular design and it has been suggested that we should add in an op amp amplifier to increase the overdrive voltage therefor decreasing the propagation delays and error in final measurement. The issue that we are trying to get over is that our system specifications are to have a distance measurement accuracy plus or minus 5 cm. Our understanding is that the propagation delay from the overdrive issue is not linear and we can't calibrate for that in the software later. So adding in a pre-amplifier to increase the overdrive voltage will decrease error. I'm trying to do simulations to model the error in TINA-TI and want to make sure I'm setting the circuit up correctly and interpreting the results right. I made the following model based on suggestions from another engineer:
Having some trouble trying to run the transient analysis, this is what I'm seeing:
I'm not really very familiar with SPICE and this is the first time I've ever used TINA-TI so I'm going through a learning curve here.
Also not sure if the LM158 is the best op amp to use for this, maybe it would be more optimal to go with the OPA858 as used in the lidar reference design but not configured as a transimpedance amplifier? It would be good if the op amp came in a packaging option that would be easy for prototyping on a breadboard.
Thanks for any input you have!