title: A programmable low power current source for bioimpedance measurement: Towards a wearable personalized health assistant.
abstract: Bioimpedance is a noninvasive measurement method that 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. 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 MO @ 250 KHz is achieved at full current capacity. Total current consumption is comparable to the injected current, making the circuit highly efficient.
authors.forename: Zaid
authors.initials: Z
authors.lastname: Hamed
authors.forename: Hannu
authors.initials: H
authors.lastname: Tenhunen
authors.forename: Geng
authors.initials: G
authors.lastname: Yang
mesh_terms: D017097:Electric Impedance; D011211:Electric Power Supplies; D006801:Humans; D008991:Monitoring, Physiologic / Q000295:instrumentation / Q000379:methods; D012815:Signal Processing, Computer-Assisted