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A Battery-less 507nW SoC with Integrated Platform Power Manager and SiP Interfaces

Research Publication

A 507nW self-powered SoC is demonstrated for ultra-low power (ULP) internet-of-things (IoT) applications. The SoC includes ULP system-in-package (SiP) interfaces that enable its harmonious integration with a radio transmitter (TX) and a non-volatile memory (NVM). The energy harvesting platform power manager (EH-PPM) powers the SoC as well as off-chip components and is optimized for low quiescent power. It supplies the SoC with 0.5V, 1.0V, and 1.8V and can also power ULP sensors and the SiP components while running an example shipping-integrity tracking algorithm. A power monitor (PM) cold-boots the SoC from NVM and adapts the system’s power consumption. The tight integration between the SoC’s blocks enables sub-µW operation.

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A 10 mV-Input Boost Converter With Inductor Peak Current Control and Zero Detection for Thermoelectric and Solar Energy Harvesting With 220 mV Cold-Start and 14.5 dBm, 915 MHz RF Kick-Start

Research Publication

A boost converter for thermoelectric energy harvesting in 130 nm CMOS achieves energy harvesting from a 10 mV input, which allows wearable body sensors to continue operation with low thermal gradients. The design uses a peak inductor current control scheme and duty cycled, offset compensated comparators to maintain high efficiency across a broad range of input and output voltages. The measured efficiency ranges from 53% at Vi = 20mV to a peak efficiency of 83% at Vi = 300mV. A cold-start circuit starts the operation of the boost converter from 220 mV, and an RF kick-start circuits starts it from -14.5 dBm at 915 MHz RF power.

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