Abstract
Low power, low cost inductively powered passive biotelemetry system involving fully customized RFID/NFC interface base SoC has gained popularity in the last decades. However, most of the SoCs developed are application specific and lacks either on-chip computational or sensor readout capability. In this paper, we present design details of a programmable passive SoC in compliance with ISO 15693/NFC5 standard for biomedical applications. The integrated system consists of a 32-bit microcontroller, a sensor readout circuit, a 12-bit SAR type ADC, 16 kB RAM, 16 kB ROM and other digital peripherals. The design is implemented in a 0.18 μ m CMOS technology and used a die area of 1.52 mm × 3.24 mm. The simulated maximum power consumption of the analog block is 592 μ W. The number of external components required by the SoC is limited to an external memory device, sensors, antenna and some passive components. The external memory device contains the application specific firmware. Based on the application, the firmware can be modified accordingly. The SoC design is suitable for medical implants to measure physiological parameters like temperature, pressure or ECG. As an application example, the authors have proposed a bioimplant to measure arterial blood pressure for patients suffering from Peripheral Artery Disease (PAD).
Highlights
Inductive powered biomedical systems brought in complete new dimension in the medical field over the last century
We present design details of a programmable passive SoC in compliance with ISO 15693/NFC5 standard for biomedical applications
The design is implemented in a 0.18 μm CMOS technology and used a die area of 1.52 mm × 3.24 mm
Summary
Inductive powered biomedical systems brought in complete new dimension in the medical field over the last century. A batteryless body sensor node is recorded in [13] is suitable for acquiring, processing and transmitting electrocardiogram (ECG), electromyogram (EMG) and EEG (EEG) This is the only SoC among all which includes an 8-bit microcontroller without NFC communication capability. A batteryless (passive) SoC which includes RFID/NFC interface, PMU (power management unit), sensor readout interface, integrated ADC (analog to digital converters), integrated microcontroller and is unspecific to a particular application lacks. The mixed signal SoC presented in this paper is designed for low power passive sensor system applications first proposed in [17,18]. An NFC capable smart device like a smartphone or a tablet can be used to communicate with a sensor tag developed with the proposed SoC. The frequency range of 13.56 MHz provides a good tradeoff in-between wavelength deviation, read range and data rate
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