Abstract
In this work, an asynchronous multi-sensor micro control unit (MCU) core is proposed for wireless body sensor networks (WBSNs). It consists of asynchronous interfaces, a power management unit, a multi-sensor controller, a data encoder (DE), and an error correct coder (ECC). To improve the system performance and expansion abilities, the asynchronous interface is created for handshaking different clock domains between ADC and RF with MCU. To increase the use time of the WBSN system, a power management technique is developed for reducing power consumption. In addition, the multi-sensor controller is designed for detecting various biomedical signals. To prevent loss error from wireless transmission, use of an error correct coding technique is important in biomedical applications. The data encoder is added for lossless compression of various biomedical signals with a compression ratio of almost three. This design is successfully tested on a FPGA board. The VLSI architecture of this work contains 2.68-K gate counts and consumes power 496-μW at 133-MHz processing rate by using TSMC 0.13-μm CMOS process. Compared with the previous techniques, this work offers higher performance, more functions, and lower hardware cost than other micro controller designs.
Highlights
The necessity of health monitoring systems using wireless transmission has become prevalent [1,2,3,4]
Since the reliability is significant in biomedical applications, we developed an error correction coder to prevent loss error from wireless transmissions
To further improve the performance, in this work mode combined with creative data encoder (DE), and error correct coder (ECC) functions, it guarantees that the gains of each creative function are fully utilized
Summary
The necessity of health monitoring systems using wireless transmission has become prevalent [1,2,3,4]. The concept of multi-sensor design, which combines different wireless body sensors for flexibility, multi-application, efficiency, and low cost, has been implemented in the literature [11,12,13]. In MCU integration design, Amirtharajah [17] presented a micro-power programmable DSP which uses variable precision arithmetic and low-voltage circuits to implement a biomedical detection. Chen [20] presented a MCU circuit with adaptive low power design for wireless body sensor network. In order to accommodate the above-mentioned necessary functionalities in implementing multi-sensor architecture in biomedical applications, a VLSI implementation of asynchronous multi-sensor micro control unit for WBSNs, which performs more function and control abilities, is proposed in this paper. Techniques are integrated into the system to minimize power loss and ensure data integrity, respectively
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