Xiaosen Liu

TL;DR: A monolithic microwatt-level charge pump energy harvester for smart nodes of Internet of Things (IOT) networks was optimized by the proposed architecture and circuit level innovations and achieved a flattened and improved PCE as high as 89% for ultra-low power operation capability below 50 μW.

TL;DR: This paper presents a fully-integrated μW-level photovoltaic (PV) self-sustaining energy harvesting system proposed for smart nodes of Internet of Things (IOT) networks, and measured results showed that the PV harvesting system achieved both ultra-low power operation capability at 12 μW and a peak self-Sustaining efficiency of 86%.

TL;DR: A hill-climbing maximum power point tracking algorithm is developed in an energy-efficient manner to tune the input impedance of the system and guarantee adaptive maximum power transfer under wide illumination conditions, and a capacitor value modulation is implemented to achieve a higher efficiency than the traditional pulse-frequency modulation scheme.

TL;DR: A fully integrated digitally controlled two-phase buck voltage regulator with on-die solenoid inductors with a planar magnetic core is demonstrated in 14-nm tri-gate CMOS for fine-grained power delivery/management domains of high power density in system-on-chips while enabling ultra-thin (z-height) packages.

TL;DR: In this article, a bandpass filter (BPF) oscillator was used for the automatic tracking of piezoelectric transducers (PTs) in an ultrasonic vessel sealing and dissecting system, where accurate displacement regulation over a wide range of loads is required.