Low power mixed analog-digital signal processing

  • Authors:

  • Mattias Duppils;Christer Svensson

  • Affiliations:

  • Electronic Devices, Department of Physics, Linköpings Universitet, SE-581 83 Linköping, Sweden;Electronic Devices, Department of Physics, Linköpings Universitet, SE-581 83 Linköping, Sweden

  • Venue:
  • ISLPED '00 Proceedings of the 2000 international symposium on Low power electronics and design
  • Year:
  • 2000

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Abstract

The power consumption of mixed-signal systems featured by an analog front-end, a digital back-end, and with signal processing tasks that can be computed with multiplications and accumula冒tions, is analyzed. An implementation is proposed, composed of switched-capacitor mixed analog/digital multiply accumulate units in the analog front-end, followed by an A/D converter. This imple冒mentation is shown to be superior in respect of power consumption compared to an equivalent implementation with a high-speed A/D converter in the front-end, to execute signal processing tasks that include decimation. The power savings are only due to relaxed requirement on A/D conversion rate, as a direct consequence of the decimation. In a case study of a narrowband FIR filter, realized with four multiply accumulate units, and with a decimation factor of 100; power saving is 54 times. Implementation details are given, the power consumption, and the thermal noise are analyzed.