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Chip-Scale Integration of Data-Gathering Microsystems

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2 Author(s)
Lemmerhirt, D.F. ; Dept. of Electr. Eng. & Comput. Sci., Michigan Univ., Ann Arbor, MI, USA ; Wise, K.D.

Integrated microsystems merging embedded computing with sensing and actuation are poised to dramatically expand our ability to gather information from the nonelectronic world. Examples include a microassembled multichip electronic interface to the brain, an integrated electrofluidic gas chromatography system for environmental monitoring, and a wireless intra-arterial microsystem for pressure and flow measurements. In general, such microsystems will consist of a few chips, integrated in generic platforms that are customized for a given application by the sensors selected and by software. This paper illustrates this approach with a 0.15-cm/sup 3/ multisensor microsystem for autonomously sensing and storing environmental and biological data. The microsystem is formed using on-board pressure/temperature/humidity sensors, off-board strain gauges and neural/EMG electrodes, a custom sensor-interface chip, a mixed-signal microcontroller, and a nonvolatile memory. These components allow the acquisition and storage of multidomain data at low power levels (< 50 /spl mu/W reading capacitive sensors at 1 Hz). The system is programmable in gain (0.4-3.2 mV/fF), offset (10b), accuracy (14b), and sampling rate (0.1 Hz-10 kHz) and is integrated in a micromachined silicon platform that implements through-wafer interconnects, solder-based microconnectors, and recessed cavities for chip-stacking. The microsystem is realized in 9.5 mm/spl times/7.6 mm/spl times/2.0 mm (0.15 cm/sup 3/) (< 0.5 cm/sup 3/ with a lithium battery).

Published in:

Proceedings of the IEEE  (Volume:94 ,  Issue: 6 )

Date of Publication:

June 2006

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