TY - GEN
T1 - Self-powered CMOS impact-rate monitors for biomechanical implants
AU - Huang, Chenling
AU - Chakrabartty, Shantanu
PY - 2008
Y1 - 2008
N2 - We have previously reported a novel self-powered piezo-floating-gate sensor that can be used for long-term monitoring of strain levels in biomechanical implants. In this paper, we extend this work to monitor impact-rates (rate of change of strain levels) which is important for predicting mechanical fatigue. We augment the piezo-floating-gate sensor with a filtering and triggering circuit that activates the ionized-hot-electron-injection (IHEI) only when the impactrates exceed predetermined threshold levels. Using multiple prototypes fabricated in a 0.5-μm standard CMOS process we characterize the performance of the sensor for mismatch and for its variability under different biasing conditions. Experimental results obtained using the prototypes demonstrate that the sensor can record different impact-rate levels over a duration of 10 5 cycles.
AB - We have previously reported a novel self-powered piezo-floating-gate sensor that can be used for long-term monitoring of strain levels in biomechanical implants. In this paper, we extend this work to monitor impact-rates (rate of change of strain levels) which is important for predicting mechanical fatigue. We augment the piezo-floating-gate sensor with a filtering and triggering circuit that activates the ionized-hot-electron-injection (IHEI) only when the impactrates exceed predetermined threshold levels. Using multiple prototypes fabricated in a 0.5-μm standard CMOS process we characterize the performance of the sensor for mismatch and for its variability under different biasing conditions. Experimental results obtained using the prototypes demonstrate that the sensor can record different impact-rate levels over a duration of 10 5 cycles.
UR - http://www.scopus.com/inward/record.url?scp=63649105704&partnerID=8YFLogxK
U2 - 10.1109/BIOCAS.2008.4696955
DO - 10.1109/BIOCAS.2008.4696955
M3 - Conference contribution
AN - SCOPUS:63649105704
SN - 9781424428793
T3 - 2008 IEEE-BIOCAS Biomedical Circuits and Systems Conference, BIOCAS 2008
SP - 385
EP - 388
BT - 2008 IEEE-BIOCAS Biomedical Circuits and Systems Conference, BIOCAS 2008
T2 - 2008 IEEE-BIOCAS Biomedical Circuits and Systems Conference, BIOCAS 2008
Y2 - 20 November 2008 through 22 November 2008
ER -