An 8-bit, 10 kHz, 5.1 μW, 0.18 μm CMOS SAR ADC for RFID applications with sensing capabilities

  • Authors:
  • J. Marjonen;O. Vermesan;H. Rustad

  • Affiliations:
  • Technical Research Centre of Finland, VTT, VTT, Finland 02144;SINTEF, Oslo, Norway 0314;SINTEF, Oslo, Norway 0314

  • Venue:
  • Analog Integrated Circuits and Signal Processing
  • Year:
  • 2011

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Abstract

An 5.1 μW, 1.8 V, 8-bit, successive approximation (SAR) analog-to-digital converter (ADC) using 10 kHz clock was designed and fabricated in a 0.18 μm CMOS technology for passive UHF radio frequency identification (RFID) applications. The ADC utilises a resistive digital to analog converter (DAC). The ADC can operate with low power consumption. The proposed comparator with cascode active load can offer large gain and can operate at a low supply voltage. The measured total power consumption is 5.1 μW at a 10 kHz input clock with a 1.8 V single supply, and 0.5 μW with 970 mV supply.