Sökning: "ultra-low power"

Visar resultat 11 - 15 av 49 avhandlingar innehållade orden ultra-low power.

1. 11. Ultra-low Power Design Approaches in Memories and Assist Techniques

   Författare :Babak Mohammadi; Integrerade elektroniksystem; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Memory; SRAM; assist technique; charge pump; ULP; ULV;

   Sammanfattning : The need for more functionality and higher performance has increased the number of transistors to billions in current processors. A high number of transistors on the same chip area increases the power density, which in turn heats up the devices and lowers the life time of batteries. LÄS MER

3. 12. Duty-cycled Wake-up Schemes for Ultra-low Power Wireless Communications

   Författare :Nafiseh Seyed Mazloum; Institutionen för elektro- och informationsteknik; []
   Nyckelord :;

   Sammanfattning : In sensor network applications with low traffic intensity, idle channel listening is one of the main sources of energy waste.The use of a dedicated low-power wake-up receiver (WRx) which utilizes duty-cycled channel listening can significantlyreduce idle listening energy cost. LÄS MER

4. 13. Ultra-low-power Design and Implementation of Application-specific Instruction-set Processors for Ubiquitous Sensing and Computing

   Författare :Ning Ma; Lirong Zheng; Zhonghai Lu; Zhuo Zou; Jari Nurmi; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

   Sammanfattning : The feature size of transistors keeps shrinking with the development of technology, which enables ubiquitous sensing and computing. However, with the break down of Dennard scaling caused by the difficulties for further lowering supply voltage, the power density increases significantly. LÄS MER

5. 14. On Gate Drivers for MOS-Controlled Power Devices and dv-dt Filters for Train Traction Converters

   Författare :Erik Velander; Hans-Peter Nee; Francesco Iannuzzo; KTH; []
   Nyckelord :Power semiconductor devices; DC-AC power converters; Silicon carbide; Insulated gate bipolar transistors; P-i-n diodes; Schottky diodes; Traction motors; Power MOSFET; Krafthalvledare; DC-AC kraftomvandlare; kiselkarbid; IGBT; P-i-n dioder; Schottky dioder; traktionsmotorer; Effekt-MOSFET; Electrical Engineering; Elektro- och systemteknik;

   Sammanfattning : In this thesis, low-loss gate-drive solutions and a proposed dv/dt-filter have been investigated with focus on train traction converters with dv/dt constraints.By using the silicon carbide (SiC) junction field-effect transistor (JFET), the switching losses can be significantly reduced compared to the commonly used insulated-gate bipolar transistor (IGBT), but complex gate-driver solutions are required for high utilization in terms of loss reduction. LÄS MER

7. 15. Experimental Investigations of High Pressure Catalytic Combustion for Gas Turbine Applications

   Författare :Jeevan Jayasuriya; Torsten Fransson; Groppi Gianpiero; KTH; []
   Nyckelord :Gas Turbine Combustion; Catalytic Combustion; High Pressure; Ultra-low emissions; SRA - Energy; SRA - Energi;

   Sammanfattning : This work is devoted to generate knowledge and high quality experimental data of catalytic combustion at operational gas turbine conditions.The initial task of the thesis work was to design and construct a high pressure combustion test facility, where the catalytic combustion experiments can be performed at real gas turbine conditions. LÄS MER