TY - GEN
T1 - An adaptive analog front end for a flexible PPG sensor patch with self-determined motion related DC drift removal
AU - Pandey, Rajeev Kumar
AU - Chao, Paul C.-P.
N1 - Publisher Copyright:
© 2021 IEEE
PY - 2021/5
Y1 - 2021/5
N2 - This paper presents, a DC drift compensated (due to motion <1Hz), high sensing precision and wide dynamic range analog front end (AFE) for the organic type PPG sensor. The proposed AFE utilizes an auto-programmable trans-impedance amplifier (TIA) with the DC-current cancellation loop and a band pass filter to compensate the DC drift either due to motion or ambient light change. The prototype of the readout circuit is implemented in an integrated chip with an area of 3mm2 via the TSMC 180nm process. The experiment result shows that the designed readout can sense linearly from 1nA to maximum 40µA current, with a resultant dynamic range of 90dB and the measured input-referred noise is 0.256 nA/ √ Hz. The total measured power consumption of the readout circuit is 460µW, while the power consumption of the on-chip OLED driver is 1.8 mW. The obtained PPG signals from the wrist are subsequently processed with quality checking, and feature extraction. The measured accuracy and standard error for the heart rate estimation are 96%, and -0.12±5 beats/minute, respectively.
AB - This paper presents, a DC drift compensated (due to motion <1Hz), high sensing precision and wide dynamic range analog front end (AFE) for the organic type PPG sensor. The proposed AFE utilizes an auto-programmable trans-impedance amplifier (TIA) with the DC-current cancellation loop and a band pass filter to compensate the DC drift either due to motion or ambient light change. The prototype of the readout circuit is implemented in an integrated chip with an area of 3mm2 via the TSMC 180nm process. The experiment result shows that the designed readout can sense linearly from 1nA to maximum 40µA current, with a resultant dynamic range of 90dB and the measured input-referred noise is 0.256 nA/ √ Hz. The total measured power consumption of the readout circuit is 460µW, while the power consumption of the on-chip OLED driver is 1.8 mW. The obtained PPG signals from the wrist are subsequently processed with quality checking, and feature extraction. The measured accuracy and standard error for the heart rate estimation are 96%, and -0.12±5 beats/minute, respectively.
KW - Filter
KW - Flexible patch
KW - Motion artifact rejection (MAR)
KW - OLED
KW - OPD
KW - Photoplethysmography (PPG) Sensor
UR - http://www.scopus.com/inward/record.url?scp=85108997656&partnerID=8YFLogxK
U2 - 10.1109/ISCAS51556.2021.9401265
DO - 10.1109/ISCAS51556.2021.9401265
M3 - Conference contribution
AN - SCOPUS:85108997656
T3 - Proceedings - IEEE International Symposium on Circuits and Systems
BT - 2021 IEEE International Symposium on Circuits and Systems, ISCAS 2021 - Proceedings
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 53rd IEEE International Symposium on Circuits and Systems, ISCAS 2021
Y2 - 22 May 2021 through 28 May 2021
ER -