title: Current source for multifrequency broadband electrical bioimpedance spectroscopy systems. A novel approach.
abstract: New research and clinical applications of broadband electrical bioimpedance spectroscopy arise; increasing the upper limit frequency used in the measurement systems. The current source, an essential block of an electrical bioimpedance impedance analyzer, must have a large-enough output impedance at any frequency of operation to keep the output current constant regardless of the value of working load. In this paper a novel approach to increase the output impedance of a common voltage controlled current source is proposed. The circuit is analyzed, implemented and tested. The results, remarking the significant effect of the circuit parasitic capacitances, show a clear increment of the output impedance, but smaller than the originally expected.
authors.affiliation: School of Engineering, University College of Borås, Borås, Sweden. fernando.seoane@hb.se
authors.forename: Fernando
authors.initials: F
authors.lastname: Seoane
authors.forename: Ramon
authors.initials: R
authors.lastname: Bragós
authors.forename: Kaj
authors.initials: K
authors.lastname: Lindecrantz
mesh_terms: D000465:Algorithms; D004553:Electric Conductivity; D017097:Electric Impedance; D004560:Electricity; D004582:Electronics, Medical / Q000295:instrumentation* / Q000379:methods; D004867:Equipment Design; D010992:Plethysmography, Impedance / Q000295:instrumentation* / Q000379:methods; D012815:Signal Processing, Computer-Assisted; D012984:Software; D013057:Spectrum Analysis / Q000295:instrumentation* / Q000379:methods; D014054:Tomography