Essays about: "spänning och frekvensskalning"

Found 2 essays containing the words spänning och frekvensskalning.

  1. 1. Low-Power Policies Based on DVFS for the MUSEIC v2 System-on-Chip

    University essay from KTH/Skolan för informations- och kommunikationsteknik (ICT)

    Author : Siva Sai Reddy Mallangi; [2017]
    Keywords : Multi functional health monitoring wearable devices are quite prominent these days. Usually these devices are battery-operated and consequently are limited by their battery life from few hours to a few weeks depending on the application . Of late; it was realized that these devices; which are currently being operated at fixed voltage and frequency; are capable of operating at multiple voltages and frequencies. By switching these voltages and frequencies to lower values based upon power requirements; these devices can achieve tremendous benefits in the form of energy savings. Dynamic Voltage and Frequency Scaling DVFS techniques have proven to be handy in this situation for an efficient trade-off between energy and timely behavior. Within imec; wearable devices make use of the indigenously developed MUSEIC v2 Multi Sensor Integrated circuit - version 2.0 . This system is optimized for efficient and accurate collection; processing; and transfer of data from multiple health sensors. MUSEIC v2 has limited means in controlling the voltage and frequency dynamically. In this thesis we explore how traditional DVFS techniques can be applied to the MUSEIC v2. Experiments were conducted to find out the optimum power modes to efficiently operate and also to scale up-down the supply voltage and frequency. Considering the overhead caused when switching voltage and frequency; transition analysis was also done. Real-time and non real-time benchmarks were implemented based on these techniques and their performance results were obtained and analyzed. In this process; several state of the art scheduling algorithms and scaling techniques were reviewed in identifying a suitable technique. Using our proposed scaling technique implementation; we have achieved 86.95% power reduction in average; in contrast to the conventional way of the MUSEIC v2 chip’s processor operating at a fixed voltage and frequency. Techniques that include light sleep and deep sleep mode were also studied and implemented; which tested the system’s capability in accommodating Dynamic Power Management DPM techniques that can achieve greater benefits. A novel approach for implementing the deep sleep mechanism was also proposed and found that it can obtain up to 71.54% power savings; when compared to a traditional way of executing deep sleep mode. Keywords - low-power; DVFS; DPM; energy; wearable devices; voltage and frequency scal- ing; låg effekt; DVFS; DPM; energi; bärbara enheter; spänning och frekvensskalning;

    Abstract : Multi functional health monitoring wearable devices are quite prominent these days. Usually these devices are battery-operated and consequently are limited by their battery life (from few hours to a few weeks depending on the application). READ MORE

  3. 2. Power-Aware Scheduling for Embedded Real-Time Systems

    University essay from KTH/Maskinkonstruktion (Inst.)

    Author : Stefan Olofsson; [2009]
    Keywords : ;

    Abstract : Fokus i detta examensarbete ligger på att utveckla en DVFS algoritm för en schemaläggare. Denna algoritm ska sedan implementeras i ett inbyggt realtidssystem. Huvudsyftet för DVFS algoritmen är att möjliggöra för systemet att välja rätt spänning och frekvens för att kunna minska systemets energiförbrukning. READ MORE