CBL - Campus del Baix Llobregat

Projecte llegit

Títol: Quadrature synchronous sampling for electrical impedance plethysmography implemented on an MSP432 microcontroller

Estudiants que han llegit aquest projecte:

Director/a: SERRANO FINETTI, ERNESTO

Departament: EEL

Títol: Quadrature synchronous sampling for electrical impedance plethysmography implemented on an MSP432 microcontroller

Data inici oferta: 02-02-2017     Data finalització oferta: 02-10-2017


Estudis d'assignació del projecte:
    MU MASTEAM 2015
Tipus: Individual
 
Lloc de realització: EETAC
 
Paraules clau:
impedance measurement, synchronous sampling
 
Descripció del contingut i pla d'activitats:
Synchronous quadrature sampling is a method that yields both
the real amnd imaginary parts of an amplitude modulated signal
without an analog demodulation stage. Previous works have
shown the feasibility of obtaining high-resolution
measurements that enable the acquistion of small,
physiologically-related impedance phlethysmopgraphy signals
for a single carrier frequency. However, there are situations
where it might be interesting carrying out automated
multifrequency measurements.

The main goal of this work will be the proposal of a
measurement system capable of measuring very small
bioimpedance variations (real and imaginary parts) at multiple
frequencies. For its impmementation, a 32-bit MSP432 family
microcontroller will be used where low-power design features
will be highly relevant.


The work involves:

1. Document the state-of-the-art in high-resolution complex
impedance measurement.
2. Proposal of PWM-based multifrequency sine-wave generation.
3. Design of the differential to single-ended analog frontend.
4. Verification of the proposed measurement system with
discrete impedances
5. Validation tests.
6. Overall assessment of the capabilities and limitations of
the proposed system.

 
Overview (resum en anglès):
The developed project allows getting IPG through Quadrature Synchronous Sampling using the new 32 bit MCU MSP432 from texas instruments.

It is able to work from ranged frequencies 10 kHz to 1 MHz with a precision of 14 bits and 10 bits respectively.

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