Current Source for Multifrequency Broadband Electrical Bioimpedance Spectroscopy Systems : A Novel Approach

• 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

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Medicinteknik -- Medicinsk laboratorie- och mätteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Medical Engineering -- Medical Laboratory and Measurements Technologies (hsv//eng)

Nyckelord

active networks

bioelectric potentials

biomedical measurement

electric impedance imaging

electric impedance measurement

power supplies to apparatus

circuit parasitic capacitance effect

common voltage controlled current source

electrical bioimpedance impedance analyzer

measurement system

multifrequency broadband electrical bioimpedance spectroscopy

output impedance

working load

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