A multiple-output stimulation ASIC for a peripherallyimplantable neurostimulaiton system was implemented in a 0.18µm CMOS process. The numbers of anodic outputs (NE A ) and cathodic outputs (NE C ) can be set between 1 and 8 with a fixed total output current up to 32.6mA, independent of NE A and NE C . Fast turn on technique was proposed for the stimulator to achieve a settling time of <5.8µs. The ASIC includes a power management unit and an electrode monitoring circuit, which consists of a 10-b ADC for monitoring the high voltage (~15V) stimulator outputs.
The present study describes the MEMS-based piezoelectric switch to activate the event-driven wireless sensor node for chicken health monitoring system. We have fabricated the switch composed of "S" shaped piezoelectric cantilever and proof mass, where the resonance is 24 Hz. When the switch has been vibrated at 4, 6, 8, and 12 Hz, which is close to the chicken movement frequency, the input vibration was converted into the resonant one through superharmonic resonance leading to enough voltage to activate event-driven operation.
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