Hello everyone,
I'm currently planning a setup where (among other things) a galvanometer mirror helps a laser scan a certain area. For different mirror positions the laser should be on and for others off. You could imagine a shutter controlling the beam here.
I would like to open and close this shutter (acousto-optic modulator) really fast. Really fast in this case means 2 MHz. However, the shutter should not be modulated periodically, e.g. with constant frequency. The shutter shall open, when an analog input signal Uin is above a certain threshold U1 and close again above another threshold U2.
Furthermore, the voltages U1 and U2 are provided digitally as 16 bit numbers. Both are not static, however. They will change in the worst case with a frequency of 1 MHz.
An added bonus would be, if the actual level of Uout does not have to be binary but could also be modulated with 1 MHz.
I tried to sketch a schematic for this and attached it to this posting.
I thought about solving this problem using an FPGA with really fast ADCs and DACs on a Mezzanine Card, which is connected via FMC to the FPGA board. This would fulfill my specifications, however I get the constant feeling that I'm overshooting my specifications here. Is a FPGA really suited for this application or am I overlooking an obvious implementation with a cheaper system?
Thank you!
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