TY - JOUR
T1 - A near-infrared heart rate measurement IC with very low cutoff frequency using current steering technique
AU - Wong, Alex
AU - Pun, Kong Pang
AU - Zhang, Yuan Ting
AU - Hung, Kevin
N1 - Funding Information:
Manuscript received January 31, 2005; revised July 28, 2005. This work was supported by the Innovative Technology Commission (ITS/114/04), Hong Kong, and cosponsored by Standard Telecommunications Ltd. (STL), Integrated Display Technology (IDT), and Jetfly Technology Ltd. This paper was recommended by Guest Editor T. S. Lande.
PY - 2005/12
Y1 - 2005/12
N2 - A near-infrared heart-rate measurement IC that processes the photoplethysmographic signal was designed using a 0.35-μm CMOS technology. The IC consists of a current-to-voltage (I-V) converter, a buffer, a sample-and-hold circuit, a second-order continuous-time low-pass filter (CT-LPF), a comparator, and a timing circuit that is used to pulse the external light-emitting diode with a very low duty cycle to reduce its power consumption. The current steering technique is employed in the design of the CT-LPF to meet the requirement for very low cutoff frequency. The circuit operates from a 3-V lithium battery, occupies a core area of 0.46 mm2 and has a power consumption of 4.5 mW. The measurement results corroborate with simulation results and show that the CT-LPF can achieve a cutoff frequency of as low as 0.25 Hz. This demonstrates the feasibility of current steering technique in the design of filter for low-frequency application.
AB - A near-infrared heart-rate measurement IC that processes the photoplethysmographic signal was designed using a 0.35-μm CMOS technology. The IC consists of a current-to-voltage (I-V) converter, a buffer, a sample-and-hold circuit, a second-order continuous-time low-pass filter (CT-LPF), a comparator, and a timing circuit that is used to pulse the external light-emitting diode with a very low duty cycle to reduce its power consumption. The current steering technique is employed in the design of the CT-LPF to meet the requirement for very low cutoff frequency. The circuit operates from a 3-V lithium battery, occupies a core area of 0.46 mm2 and has a power consumption of 4.5 mW. The measurement results corroborate with simulation results and show that the CT-LPF can achieve a cutoff frequency of as low as 0.25 Hz. This demonstrates the feasibility of current steering technique in the design of filter for low-frequency application.
KW - Biomedical sensor
KW - Biomedical signal acquisition
KW - Current-steering
KW - Heart-rate measurement
KW - Near-infrared (NIR) sensor
KW - Photoplethysmogram (PPG)
KW - Very low cutoff frequency filter
UR - http://www.scopus.com/inward/record.url?scp=29344465145&partnerID=8YFLogxK
U2 - 10.1109/TCSI.2005.857767
DO - 10.1109/TCSI.2005.857767
M3 - Article
AN - SCOPUS:29344465145
SN - 1057-7122
VL - 52
SP - 2642
EP - 2647
JO - IEEE Transactions on Circuits and Systems I: Regular Papers
JF - IEEE Transactions on Circuits and Systems I: Regular Papers
IS - 12
ER -