TY - JOUR
T1 - A Low-Power Sensitive Integrated Sensor System for Thermal Flow Monitoring
AU - Lu, Ruikuan
AU - Arifuzzman, A. K.M.
AU - Hossain, Md Kamal
AU - Gardner, Steven
AU - Eliza, Sazia A.
AU - Alexander, J. Iwan D.
AU - Massoud, Yehia
AU - Haider, Mohammad R.
N1 - Generated from Scopus record by KAUST IRTS on 2022-09-13
PY - 2019/12/1
Y1 - 2019/12/1
N2 - Thermal-based flow monitoring has found widespread applications due to its noncontact measurement, high sensitivity, low flow resistance, miniaturization, ease of integration, and low-power consumption. In this work, a low-cost and affordable inkjet-printed graphene-based thermal sensor is integrated with a low-power CMOS circuit for flow rate monitoring. The custom inkjet-printed sensor consists of a silver nanoparticle interdigitated pattern with a coating of graphene, all printed on a glossy photo-paper substrate. The sensor read-out circuit is an energy-efficient current-starved ring oscillator. The sensor current controls the bias current of a current-starved ring oscillator and modulates the output frequency. A driver circuit then transforms the output to a square wave pulse signal. The scheme is designed and fabricated using the 0.13-μm standard CMOS process and occupies an area of 1.5 mm ×1.7 mm. Test results indicate that the prototype ring oscillator circuit consumes 19-90μW for an oscillation frequency variation of 517 kHz-6.45 MHz. The output frequency variation with sensor current shows linear performance with R2 = 0.9966.
AB - Thermal-based flow monitoring has found widespread applications due to its noncontact measurement, high sensitivity, low flow resistance, miniaturization, ease of integration, and low-power consumption. In this work, a low-cost and affordable inkjet-printed graphene-based thermal sensor is integrated with a low-power CMOS circuit for flow rate monitoring. The custom inkjet-printed sensor consists of a silver nanoparticle interdigitated pattern with a coating of graphene, all printed on a glossy photo-paper substrate. The sensor read-out circuit is an energy-efficient current-starved ring oscillator. The sensor current controls the bias current of a current-starved ring oscillator and modulates the output frequency. A driver circuit then transforms the output to a square wave pulse signal. The scheme is designed and fabricated using the 0.13-μm standard CMOS process and occupies an area of 1.5 mm ×1.7 mm. Test results indicate that the prototype ring oscillator circuit consumes 19-90μW for an oscillation frequency variation of 517 kHz-6.45 MHz. The output frequency variation with sensor current shows linear performance with R2 = 0.9966.
UR - https://ieeexplore.ieee.org/document/8832189/
UR - http://www.scopus.com/inward/record.url?scp=85072510723&partnerID=8YFLogxK
U2 - 10.1109/TVLSI.2019.2935790
DO - 10.1109/TVLSI.2019.2935790
M3 - Article
SN - 1557-9999
VL - 27
SP - 2949
EP - 2953
JO - IEEE Transactions on Very Large Scale Integration (VLSI) Systems
JF - IEEE Transactions on Very Large Scale Integration (VLSI) Systems
IS - 12
ER -