The design and implementation of filter block for a blood oxygen analyzer

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Joglekar, Nikhil, Zayegh, Aladin and Veljanovski, Ronny (2011) The design and implementation of filter block for a blood oxygen analyzer. In: The 7th Jordanian International Electrical & Electronics Engineering Conference. Jordan Engineers Association, Amman, Jordan, pp. 117-122.


This paper presents the design and implementation of a Filtering block for a Bio-Signal Processor. The aim of the Biosignal Processor design is to implement a portable blood oxygen analyzer which is capable of measuring the partial pressure of Oxygen in blood. The filtering block consists of a reconfigurable FIR filter and a running average IIR filter. The reconfigurability of the FIR filter is dependent on the magnitude of the light sensor diode’s current and is implemented with a feed forward loop from the ADC output as shown in figure 1. A relation between the output of the diode and the noise in the signal is proven in this paper. The IIR filter is used in the Bio-Signal Processor to calculate the average value of signals coming from the FIR filter. The key design constraints are accuracy to compete with the traditional blood gas analyzer and power consumption to make the whole device portable. The filter design is implemented in hardware using the 0.35 micron technology file from Austriamicrosystems and synthesized using the Encounter tool from Cadence Design Systems. The arithmetic and delay units of the filter have been implemented using a novel 16-bit floating point technique.

Additional Information

Conference held: Amman, Jordan : 11-14/4/2011

Item type Book Section
Official URL
ISBN 9789957469016
Subjects Historical > FOR Classification > 0205 Optical Physics
Historical > FOR Classification > 0903 Biomedical Engineering
Historical > FOR Classification > 0906 Electrical and Electronic Engineering
Historical > SEO Classification > 8616 Computer Hardware and Electronic Equipment
Historical > Faculty/School/Research Centre/Department > Centre for Telecommunications and Micro-Electronics (CTME)
Keywords ResPubID22756, component, FIR, IIR, point of care, floating point, arithmetic, signal processing, biomedical, area analysis, power analysis, hardware, arithmetic blocks, analyser, analyser architecture, optical front end, LED, simulation of noise, dye
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