This paper presents a microsystem for biomolecular recognition (DNA, enzymes) based on a biochip, which uses magnetic -eld arraying of magnet- ically tagged biomolecules and high sensitivity sensors for single biomolecule detection. The microsystem pro- vides the electronic circuitry for addressing, reading out and sensing each of the 16X16 magnetoresistive sensors that compose the biochip. A prototype of the microsys- tem was developed and experimental results show that it is able of nanoparticle detection and, consequently, be used for magnetic labelled based bioassays.
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