I have been covering the basics of radiation effects over my last few blogs on Planet Analog and this time I discussed a bit about TID effects.  These are a little simpler to evaluate as the test procedure is relatively simple.  Of course, I say it is simple because the product test engineer has done a lot of the work for us already.  When checking a high speed ADC for TID effects the product is tested pre- and post-radiation exposure on the ATE.  A control unit is also tested for a comparison baseline.  In this case a control unit plus 4 units exposed to radiation were tested. The idea in this type of radiation analysis is to check for performance shifts in the ADC after it has been exposed to a specified amount of radiation.  In the case of the AD9246S in my blog the product was tested out to 100kRads.  As you can see below the performance has very little shift after radiation exposure which is exactly what you'd want for a space application.  Ideally there would be no shift, but in the real world things are rarely ever ideal.  However, in this case it is about as close as you can get and the AD9246S shows it holds up well to radiation for the case of TID.  If you'd like to read more please hop on over to Planet Analog and check out my blog: Planet Analog - Jonathan Harris - Total Ionizing Dose (TID) Effects with High Speed ADCs.

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