This week, I have been focused on testing the modulation boards. Last week, we assembled single-channel versions of the LED board and the driver board. Over the last few days, I have used x-ray to inspect the LED board and make sure the soldering is correct, and tested the 24 MHz light modulation. To do that, I used the Illumination board’s LVDS clock source, which is the same setup as we will have in the final application.
The modulation circuit is stable, and we can see that the high-side LED voltage (blue on the screenshot below) oscillates between zero and 24 MHz as required.
I also tested the constant-current driver with the LED board.
Once the illumination boards is ready, I helped Sid investigate power-up sequence of the power board and other firmware issues.