A low-power, reconfigurable, pipelined ADC for implantable bioimpedance measurement system with vertically aligned carbon nanofibers (VACNF) electrodes

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• 作者：Terence C. Randall ; Syed Kamrul Islam…
• 关键词：Pipelined ADC ; Low ; power data converter ; Reconfigurable data converter
• 刊名：Analog Integrated Circuits and Signal Processing
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：89
• 期：1
• 页码：139-149
• 全文大小：1,744 KB
• 刊物类别：Engineering
• 刊物主题：Circuits and Systems
  Electronic and Computer Engineering
  Signal,Image and Speech Processing
  
• 出版者：Springer Netherlands
• ISSN：1573-1979
• 卷排序：89

文摘

Implantable bioimpedance monitoring has the potential to be an extremely powerful tool for biomedical research and healthcare. Currently, signal processing, specifically analog-to-digital conversion, does not allow for power-efficient conversion of bioimpedance data over a wide spectrum of frequency. In this paper, a reconfigurable pipelined analog-to-digital converter, for bioimpedance monitoring applications is presented. The converter can operate with a sampling rate between 100 kS/s to 20 MS/s and a resolution of 8 or 10 bits depending on the signal amplitude. Furthermore, the converter is self-configurable in terms of sampling rate and resolution based on the frequency and the amplitude of the input signal. A competitive FOM range (51.7–157 fJ/conv) is achieved by taking advantage of weak-inversion-biased transistors and utilizing an interference elimination technique in the 3rd pipeline stage to increase the power efficiency. The system is realized in a standard 130 nm CMOS process and consumes 16.1 μW and 1.06 mW in 8-bit and 10-bit mode, respectively. The core area of design is only 0.426 mm2. Test results show that the proposed ADC can successfully digitize the voltage drop across a bovine cell impedance model that is derived for an implantable bioimpedance measurement sensor application using the multi-electrode array of vertically aligned carbon nanofibers (VACNF).