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imec and Holst Centre Report Ultra-low Power Heart Activity Signal Processor - International Solid State Circuit Conference, imec and Holst Centre report an analog-signal processor ASIC – in short ASP - reduces the overall power consumption of an ambulatory heart activity signal monitoring systems
imec and Holst Centre Report Ultra-low Power Heart Activity Signal Processor

 

NewswireToday - /newswire/ - Eindhoven, Netherlands, 2010/02/07 - International Solid State Circuit Conference, imec and Holst Centre report an analog-signal processor ASIC – in short ASP - reduces the overall power consumption of an ambulatory heart activity signal monitoring systems.

   
 
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At today’s International Solid State Circuit Conference, imec and Holst Centre report an analog-signal processor ASIC (application-specific integrated circuit) – in short ASP - that reduces the overall power consumption of an ambulatory heart activity signal monitoring systems by more than 5 times. This is a major step towards autonomous wireless sensor systems powered, which constantly monitor the patient’s health for diagnosis or chronic illness.

In today’s biomedical wireless sensor systems, a lot of power consumption is wasted in the DSP (digital signal processor) or radio by continuously processing biopotential signals (e.g. ECG or electrocardiogram), or transmitting raw data over the wireless link. And, today’s ambulatory biomedical sensor systems also suffer from motion artifacts which affects the robustness of detection algorithms and demands even more processing power.

The innovative ASP, developed within imec’s and Holst Centre’s HUMAN++ program, uses an adaptive sampling scheme based on activity detection. This reduces the amount of data which needs to be processed by the DSP or transmitted by the radio. By preprocessing the signal, a simplified DSP can be used for accurate R-peak detection resulting in lower power consumption of the DSP. Motion artifacts are detected by continuously monitoring the electrode-tissue impedance. The impedance monitoring can also be used for ensuring signal integrity by continuously checking the electrode connectivity.

The ASP has a record low power consumption of only 30µW operating from 2V. It consists of an ECG readout channel, two quadrature readout channels for continuous-time monitoring of electrode-tissue impedance, and two quadrature readout channels for tracking signal fluctuations in a specific frequency band. The ASP also includes an activity detector that senses the frequency content of the ECG signal and adapts the sampling rate of the integrated ADC (analog to digital convertor) for the digitization of the ECG signal. The ASP stage reduces the power consumption of the DSP and wireless transmission by 11 and 6 times respectively. This results in an overall system power dissipation below 300µW for the complete wireless heart activity signal monitoring system which is more than 5 times more power efficient than its predecessors. This power budget also includes the additional functionality of continuous-time electrode-tissue contact impedance measurement.

“Within the Human++ program, imec and Holst Centre develop solutions for an efficient and better healthcare. Self-powered intelligent body area networks with wireless sensors promise to be a solution for more comfortable healthcare systems. This breakthrough is a major step towards constant ambulatory monitoring of people using energy harvesting, which increases the comfort level of patients and is a cost- and time-efficient alternative for current monitoring systems;” said Bert Gyselinckx, general manager imec the Netherlands at Holst Centre.

Industry can get access to this technology by joining the Human++ program as research partner or by licensing agreements for further product development.

At this week’s International Solid State Circuit Conference, imec and Holst Centre present their newest breakthroughs in ultra-low power design for wireless communications and wireless sensor networks and in organic electronics with an impressive number of contributions including 10 reviewed publications and 6 contributions to tutorials and workshops.
The news release is based on paper 6.6: A 30μW Analog Signal Processor ASIC for Biomedical Signal Monitoring.

About imec
Imec (imec.be) performs world-leading research in nano-electronics. Imec leverages its scientific knowledge with the innovative power of its global partnerships in ICT, healthcare and energy. Imec delivers industry-relevant technology solutions. In a unique high-tech environment, its international top talent is committed to providing the building blocks for a better life in a sustainable society.
Imec is headquartered in Leuven, Belgium, and has offices in Belgium, the Netherlands, Taiwan, US, China and Japan. Its staff of more than 1,650 people includes over 550 industrial residents and guest researchers. In 2008, imec's revenue (P&L) was 270 million euro.

Imec is a registered trademark for the activities of IMEC International (a legal entity set up under Belgian law as a "stichting van openbaar nut”), imec Belgium (IMEC vzw supported by the Flemish Government), imec the Netherlands (Stichting IMEC Nederland, part of Holst Centre which is supported by the Dutch Government) and imec Taiwan (IMEC Taiwan Co.).

About Holst Centre
Holst Centre (holstcentre.com) is an independent open-innovation R&D centre that develops generic technologies for Wireless Autonomous Transducer Solutions and for Systems-in-Foil. A key feature of Holst Centre is its partnership model with industry and academia around shared roadmaps and programs. It is this kind of cross-fertilization that enables Holst Centre to tune its scientific strategy to industrial needs.

Holst Centre was set up in 2005 by imec (Flanders, Belgium) and TNO (The Netherlands) with support from the Dutch Ministry of Economic Affairs and the Government of Flanders. It is named after Gilles Holst, a Dutch pioneer in Research and Development and first director of Philips Research.
Located on High Tech Campus Eindhoven, Holst Centre benefits from the state-of-the-art on-site facilities. Holst Centre has over 150 employees from around 25 nationalities and a commitment from over 20 industrial partners.

Contact:
Holst Centre: Koen Snoeckx, Communication Manager, T: +31 40 277 40 91, Mobile: +31 612 719843, E: koen.snoeckx[.]holstcentre.com.

 
 
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imec and Holst Centre Report Ultra-low Power Heart Activity Signal Processor

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Imec News |
Publisher Contact: Katrien Marent - imec.be 
+32 16 28 18 80 katrien.marent[.]imec.be
 
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