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A novel single-bit reconfigurable sigma delta modulator for Wideband Wireless Sensors Applications
  • Fethi FARHAT,
  • Hassen DAHMAN
Fethi FARHAT
National Engineering School of Gabes, University of Gabes: Zrig, Gabes, TN

Corresponding Author:[email protected]

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Hassen DAHMAN
National Engineering School of Gabes, University of Gabes: Zrig, Gabes, TN
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Abstract

In this work, the design of a novel single-bit third-order reconfigurable sigma delta analog-to-digital converter (ΣΔ ADC) for global ISM band (Bluetooth, Zigbee and Wi-Fi) radio receiver is presented. The novelty is based on the design of the delay components rather than the integrators commonly used in ΣΔ modulator. For this new architecture, the oversampling frequency is maintained for the different bands. Reconfigurability relies on changing the order of the modulator. Thus, In both Bluetooth and Zigbee bands, only the top two stages (2nd order mash 11) are used, and for the Wi-Fi band, all three stages are used (3rd order mash 111). The reconfigurable ADC die chip occupies an area of 0.30 mm2. The power consumption is approximately equal to 18.6mW using a 3.3V supply voltage. The SNR is about 118 dB for Bluetooth signal and Zigbee using 2nd order modulator and about 90 dB for Wi-Fi using 3rd order modulator.