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A near-infrared heart rate measurement IC with very low cutoff frequency using current steering technique

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4 Author(s)
A. Wong ; Joint Res. Center for Biomed. Eng., Chinese Univ. of Hong Kong, China ; Kong-Pang Pun ; Yuan-Ting Zhang ; K. Hung

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.

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IEEE Transactions on Circuits and Systems I: Regular Papers  (Volume:52 ,  Issue: 12 )