Reconfigurable On-Chip Power Management System Based Complementary-Metal- Oxide-Semiconductor Switched-Capacitor DC-DC Converter For Batteryless IoT SoCs

Wong, Yan Chiew (2018) Reconfigurable On-Chip Power Management System Based Complementary-Metal- Oxide-Semiconductor Switched-Capacitor DC-DC Converter For Batteryless IoT SoCs. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

Text Reconfigurable On-Chip Power Management System Based Complementary-Metal- Oxide-Semiconductor Switched-Capacitor DC-DC Converter For Batteryless IoT SOCS.pdf - Submitted Version Restricted to Registered users only Download (1MB)

Abstract

Though Internet of Things (IoT) System-on-Chips (SoCs) show great potential,they have many design challenges that impede their widespread adoption.One of the most critical issues is node lifetime.RF energy harvesting shows a great potential to provide indefinite lifetime. However,the harvested energy is not stable and could not supply exactly as required by each functional block inside the IoT SOC.Thus,it needs to be regulated and reconfigured to different levels of supply voltages.A switched capacitor (SC) DC-DC converter is used to provide a stable and suitable power supply voltage for each functional block.The characteristics and performances of SC DCDC converter are presented.The two-phase and four-phase charge pump (CP) configuration is evaluated.The reconfigurable of SC DC-DC converter is performed based on the optimized performance.SC DC-DC converters have been broadly utilized because of compatibility to a completely on-chip implementation [1]-[3].The abilities of SC DC-DC converter either step up or step down the input supply voltage by means of controlling different conversion ratios in the power stage is preeminent.Unfortunately,the conversion ratio of conventional SC DC-DC converter is fixed for a given developed topology [4].As a result,when there is requirement to supply a different level of output voltage to other functional block in IoT SoC,the different ratios of SC DC-DC converter should be used.Besides,the harvested energy come in at uncertainty voltage level. Therefore,a reconfigurable SC DC-DC converter is required to meet various operating voltage in the SoC.A method of reconfigurable is proposed based on switching frequency parameter that is generated by current-starved voltage-controlled oscillator (CSVCRO).The CSVCRO provides various frequency range by sweeping the input voltage from 0.5V to 2.5V.As a result,the step-up and step-down operation mode are obtained.

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