A Programmable Low Power Current Source for Bioimpedance Measurement: Towards a Wearable Personalized Health Assistant

: Hamed Z, Tenhunen H, Yang G

: IEEE

: Annual International Conference of the IEEE Engineering in Medicine and Biology Society

: 2015

Annual International Conference of the IEEE Engineering in Medicine and Biology Society

: 2015 37th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

: 2015 37TH ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY (EMBC)

: IEEE ENG MED BIO

: IEEE Engineering in Medicine and Biology Society Conference Proceedings

: 2038

: 2042

: 5

: 1557-170X

Bioimpedance is a noninvasive measurement facilitates body composition analysis, besides being indicative of many other health parameters. In this work a novel programmable, low complexity, high output impedance, high voltage compliance and wideband current source for bioimpedance applications is presented. Previously, we designed, fabricated and tested in vivo a bio-patch for acquisition of multiple bio-signals [1]. Upon integration with our previous work, this circuit is envisioned to constitute part of a personalized health assistant. Simulation at worst case corners and real operation conditions was carried out using UMC-180 nm 1 poly 6 metal CMOS process. Full duty cycle, shortened or stepped square waves can be generated. Amplitude control of 8 different current levels is supported. Frequency can be tuned up to 1 MHz and an output impedance of 2.8 M Omega @ 250 KHz is achieved at full current capacity. Total current consumption is comparable to the injected current, making the circuit highly efficient.