The InSilixa chip, made in an IBM 250nm process, will cost about $30-$50. It uses a 32x32 array of molecular sensors each about 100 microns in size. A multi-step packaging process is a top challenge in making the chip.
Photo-sensors at each array point provide real time detection of chemical bonding.
Individual array elements consists of photo-diodes and heaters to stimulate chemical reactions. The chip is actively heated using 5W power.
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