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(Sep 27) Low Power Voltage Scaler Circuits with Energy Recycling


Low Power Voltage Scaler Circuits with Energy Recycling


2017.09.27 (Wed) 15:00-


Prof. Hyung Won Kim


EE Uribyeol-seminar room (E3-2, Room # 2201)


This talk introduces on-chip voltage converter and dynamic voltage scaler circuits targeted at ultra low power applications with low duty ratio such as IoT sensors.

Due to excessive size of on-chip inductors, voltage converters based on switched capacitor are in general considered as more practical approaches to on-chip designs than inductor-based DC-DC converters. 

In applications with low duty ratio, the charging cycle of the switched capacitor voltage converters account for significant energy waste, while its transition to sleep mode often leaves its unused energy lost through leakage current over a long sleep period.

We present new structure and mechanism called split charging and energy recycling voltage converter to minimize such energy waste.

We also introduce a dynamic voltage scaler architecture using DAC with efficient recharge. We discuss preliminary simulation results with MEMS switches, which demonstrate that the reduced switch resistance can provide additional energy savings.


O Analog-Digital Mixed Signal Low Power Sensing Circuit

O Touch Screen Sensing and Controller SoC research

O Designed WiFi IEEE 802.11a/b/g/n Modem+ RF SoC

O Developed WiMAX IEEE 802.16e 2×2 MIMO Modem SoC and RF IC 

O WiFi 802.11g Gateway AP SoC

O Developed 10Gbit Ethernet switch chip

O Smart Wireless Sensor network for Smart grid and wireless metering

O Low Power Multi-Channel allocation and routing for wireless network

O Vehicle-to-Vehicle high-speed self-organizatino wireless network for
autonomous cooporation driving