TY - JOUR
T1 - A Dual-Channel PPG Readout System With Motion-Tolerant Adaptability for OLED-OPD Sensors
AU - Pandey, Rajeev Kumar
AU - Chao, Paul C.P.
N1 - Publisher Copyright:
© 2007-2012 IEEE.
PY - 2022/2/1
Y1 - 2022/2/1
N2 - An adaptive PPG (Photoplethysmography) readout system for a dual-channel OLED-OPD flexible sensor is designed and developed with motion artifact (<1Hz) and ambient lighting interference successfully compensated without any additional motion sensors. The compensation is made possible by adopting multi-feedbacks and an additional reference OPD channel to cancel effectively DC drifts. In result, the quality of measured PPG is improved to the level such that long-time, continuous quality monitoring of bio-sign such as heart rate (HR) is possible. The readout is designed with an auto-programmable band-pass trans-impedance amplifier (TIA) of a 100dbΩ gain with a continuous-type DC-current cancellation loop. The rest of the readout consists of a 0.5 Hz low-pass filter, an additional second-order band-pass filter (0.1-10Hz), a difference amplifier, a motion reference channel, an analog multiplexer, a programmable gain amplifier (PGA), a digital control and a programmable DAC-PWM based auto-intensity tuned OLED driver. The readout is fabricated in an area of 9 mm2 via the TSMC 180nm process. The experiment result shows that the developed OLED-OPD readout senses well as small as 1nA current, with a measured dynamic range >90dB (1nA to 100 μA) and input-referred noise of 0.26 nA/√H, with power consumption of 460μW. The DC drift is successfully reduced to 1% of its average. The accuracy for heart rate is 96%.
AB - An adaptive PPG (Photoplethysmography) readout system for a dual-channel OLED-OPD flexible sensor is designed and developed with motion artifact (<1Hz) and ambient lighting interference successfully compensated without any additional motion sensors. The compensation is made possible by adopting multi-feedbacks and an additional reference OPD channel to cancel effectively DC drifts. In result, the quality of measured PPG is improved to the level such that long-time, continuous quality monitoring of bio-sign such as heart rate (HR) is possible. The readout is designed with an auto-programmable band-pass trans-impedance amplifier (TIA) of a 100dbΩ gain with a continuous-type DC-current cancellation loop. The rest of the readout consists of a 0.5 Hz low-pass filter, an additional second-order band-pass filter (0.1-10Hz), a difference amplifier, a motion reference channel, an analog multiplexer, a programmable gain amplifier (PGA), a digital control and a programmable DAC-PWM based auto-intensity tuned OLED driver. The readout is fabricated in an area of 9 mm2 via the TSMC 180nm process. The experiment result shows that the developed OLED-OPD readout senses well as small as 1nA current, with a measured dynamic range >90dB (1nA to 100 μA) and input-referred noise of 0.26 nA/√H, with power consumption of 460μW. The DC drift is successfully reduced to 1% of its average. The accuracy for heart rate is 96%.
KW - Adaptive filter
KW - OLED
KW - OPD
KW - flexible patch
KW - motion artifact rejection (MAR)
KW - photoplethysmography (PPG) Sensor
UR - http://www.scopus.com/inward/record.url?scp=85122312048&partnerID=8YFLogxK
U2 - 10.1109/TBCAS.2021.3138996
DO - 10.1109/TBCAS.2021.3138996
M3 - Article
C2 - 34962876
AN - SCOPUS:85122312048
SN - 1932-4545
VL - 16
SP - 36
EP - 51
JO - IEEE Transactions on Biomedical Circuits and Systems
JF - IEEE Transactions on Biomedical Circuits and Systems
IS - 1
ER -