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An ultra-low-power RF transceiver for WBANs in medical applications

Zhang Qi, Kuang Xiaofei and Wu Nanjian

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Abstract: A 2.4 GHz ultra-low-power RF transceiver with a 900 MHz auxiliary wake-up link for wireless body area networks (WBANs) in medical applications is presented. The RF transceiver with an asymmetric architecture is proposed to achieve high energy efficiency according to the asymmetric communication in WBANs. The transceiver consists of a main receiver (RX) with an ultra-low-power free-running ring oscillator and a high speed main transmitter (TX) with fast lock-in PLL. A passive wake-up receiver (WuRx) for wake-up function with a high power conversion efficiency (PCE) CMOS rectifier is designed to offer the sensor node the capability of work-on-demand with zero standby power. The chip is implemented in a 0.18 μm CMOS process. Its core area is 1.6 mm2. The main RX achieves a sensitivity of –55 dBm at a 100 kbps OOK data rate while consuming just 210 μA current from the 1 V power supply. The main TX achieves +3 dBm output power with a 4 Mbps/500 kbps/200 kbps data rate for OOK/4 FSK/2 FSK modulation and dissipates 3.25 mA/6.5 mA/6.5 mA current from a 1.8 V power supply. The minimum detectable RF input energy for the wake-up RX is –15 dBm and the PCE is more than 25%.

Key words: ultra-low-powerRF transceiverfast lock-in PLLpassive wake-up receiveron-off keyingfrequency shift keying

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    Received: 18 August 2015 Revised: 20 January 2011 Online: Published: 01 June 2011

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      Zhang Qi, Kuang Xiaofei, Wu Nanjian. An ultra-low-power RF transceiver for WBANs in medical applications[J]. Journal of Semiconductors, 2011, 32(6): 065008. doi: 10.1088/1674-4926/32/6/065008 Zhang Q, Kuang X F, Wu N J. An ultra-low-power RF transceiver for WBANs in medical applications[J]. J. Semicond., 2011, 32(6): 065008. doi: 10.1088/1674-4926/32/6/065008.Export: BibTex EndNote
      Citation:
      Zhang Qi, Kuang Xiaofei, Wu Nanjian. An ultra-low-power RF transceiver for WBANs in medical applications[J]. Journal of Semiconductors, 2011, 32(6): 065008. doi: 10.1088/1674-4926/32/6/065008

      Zhang Q, Kuang X F, Wu N J. An ultra-low-power RF transceiver for WBANs in medical applications[J]. J. Semicond., 2011, 32(6): 065008. doi: 10.1088/1674-4926/32/6/065008.
      Export: BibTex EndNote

      An ultra-low-power RF transceiver for WBANs in medical applications

      doi: 10.1088/1674-4926/32/6/065008
      Funds:

      The National High Technology Research and Development Program of China (863 Program)

      • Received Date: 2015-08-18
      • Accepted Date: 2011-01-05
      • Revised Date: 2011-01-20
      • Published Date: 2011-05-23

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