The Measurements for MIT 3DL1 Run

Posted on Feb 6, 2014

The chips that are termed `working well` yield about 300 mV under the beam from a laser pointer and between 40 to 80 mV under the LED light. Voltages around 100 mV were observed in a sunlit room and about 10 mV under fluorescent lighting. Our simulations ( see the design report in PDF ) predicted DC rail voltages of around 300 mV under 1 KW/m2 red light. The laser pointer power isn`t specified beyond

The Measurements for MIT 3DL1 Run
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it is "< 5 mW"; estimating its beam size to be about 15 mm2 at the distance from which we have usually used it on the chip, the highest possible intensity the chip receives is around 333 W/m2. This result seems to indicate that the photodiodes are generating more current than was calculated; the disparity is probably due to multiple absorptions as the beam passes through the top tier of diodes and is reflected back from the metal layers of the tiers underneath.

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