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      Permanent link:
      https://www.ias.ac.in/article/fulltext/sadh/045/0149

    • Keywords

       

      Sub-threshold; start-up circuit; charge pump; dynamic body-biasing; energy harvesting

    • Abstract

       

      A 260 mV start-up charge pump and oscillator applying dynamic bulk-biasing (DBB) for step-up converters in thermal energy harvesting is presented and validated through SPICE simulation. This DBB employs a dynamic substrate control circuit (DSCC) directly controlled by the pump clock. It can dynamicallyreduce sub-threshold leakages during off-state and increase conduction during on-state. This is necessary for thermoelectric harvesters with output voltages of <= 300 mV. Performance of this DBB start-up circuit is compared to those of conventional reverse and forward bulk-biasing charge pumps. According to simulated results using the TSMC180 nm CMOS model, DBB reduces kick-start voltage to 225 mV. This proposed circuit has a 1.44x–52x better overall figure-of-merit (FOM) compared with conventional circuits at a supply voltageof 260 mV. It can generate 50 lW of maximum power with an unregulated output of 2.5 V within 171 ls from cold start-up. This overall improvement in speed, power and pumping efficiency facilitates battery-less solutions in biomedical applications for wearable/implanted micro-devices

    • Author Affiliations

       

      S M MICHELLE LIM1 2 MD SHABIUL ISLAM3 M A SAWAL4 Z RAZAK1 K H YEO1 5 H Y WONG3

      1. IMEN, Universiti Kebangsaan Malaysia (UKM), 43600 Bangi, Malaysia
      2. Faculty of Computing and IT (FOCS), Tunku Abdul Rahman (TAR) University College, 53300 Kuala Lumpur, Malaysia
      3. Faculty of Engineering, Multimedia University, 63100 Cyberjaya, Malaysia
      4. Department of Electrical, Electronics and Systems Engineering, UKM, Bangi, Malaysia
      5. Department of Electrical and Electonics, TAR University College, 53300 Kuala Lumpur, Malaysia
    • Dates

       
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