Abstract

TRUJILLO ARIAS, VLADIMIR; RENGIFO RODAS, CARLOS FELIPE  and  BRAVO MONTENEGRO, DIEGO ALBERTO. Current source for embedded bioimpedance applications in a mixed signal device, PSoC 5LP. Ing. Desarro. [online]. 2020, vol.38, n.1, pp.85-103.  Epub June 01, 2021. ISSN 0122-3461.  https://doi.org/10.14482/inde.38.1.620.1.

One of the main components for bioimpe-dance measurement is the current sources, which are designed mainly from discrete analog components. Currently, the decrease in the costs of digital systems and the high scale of integration allow us to propose embedded solutions, substantially reducing the electronic components used. This article presents the design of a bipolar sinusoidal current source for bioimpedance applications based on discrete time feedback systems, fully embedded in a mixed signal device PSoC 5LP CY8C5888AXI-LP096 from Cypress semiconductor mounted on a FreeSoC2 card from SparkFun. The proposed source regulates the peak level of the bipolar current delivered by an embedded discrete time controller, measuring the voltage present in a resistor of known value which is the only element external to the source and this series with the load impedance (Resistance Shunt), achieving working frequencies up to 120 kHz, with load resistors from 50 Ω to 3 k Ω and currents between 500 LIA and 2 μA, maintaining a harmonic distortion close to 1% for most of the working range of the source.

Keywords : Bioimpedance; bipolar sinusoidal current source; mixed signal device; PSoC.

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