Fuente de corriente para aplicaciones de bioimpedancia utilizando un dispositivo de señal mixta, PSoC 5LP

Vladimir Trujillo Arias; Carlos Felipe Rengifo Rodas; Diego Alberto Bravo Montenegro

doi:10.14482/inde.38.1.620.1

Authors

Vladimir Trujillo Arias Universidad del Cauca
Carlos Felipe Rengifo Rodas Universidad del Cauca
Diego Alberto Bravo Montenegro Universidad del Cauca

DOI:

https://doi.org/10.14482/inde.38.1.620.1

Keywords:

Bioimpedance, Bipolar sinusoidal current source, Mixed signal device, PSoC

Abstract

One of the main components for bioimpedance measurement are 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 ? to 3 k? and currents between 500 ?A and 2 mA, maintaining a harmonic distortion close to 1% for most of the working range of the source.

Author Biography

Diego Alberto Bravo Montenegro, Universidad del Cauca

Ingeniero Físico (2003). Especialista en Automatización Industrial (2007). Magister en Ingenieria: enfasisi Automática (2012). Doctor en Ciencias de la Electrónica (2016). Profesor Titular Departamento de Física (Universidad del Cauca).

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