Search for dissertations about: "delta power"

Showing result 1 - 5 of 37 swedish dissertations containing the words delta power.

  1. 1. Continuous-Time Delta-Sigma Modulators for Wireless Communication

    University dissertation from Department of Electrical and Information Technology, Lund University

    Author : Mattias Andersson; Lunds universitet.; Lund University.; [2014]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; A D converter; return-to-zero; loop delay; delta-sigma; ADC; CMOS; STF; continuous-time; sigma; delta; filtering; CT; RZ;

    Abstract : The ever increasing data rates in wireless communication require analog to digital converters (ADCs) with greater requirements on speed and accuracy, while being power efficient to prolong battery life. This dissertation contains an introduction to the field and five papers that focus on the continuous-time (CT) Delta-Sigma modulator (DSM) as ADC. READ MORE

  2. 2. On methods of measuring magnetic properties of power transformers

    University dissertation from Stockholm, Sweden : Kungliga Tekniska högskolan

    Author : Claes Carrander; KTH.; [2015]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; No-load; magnetizing current; losses; diagnostics; delta; three-phase; power transformer; magnetic core; electrical steel; measurements; simulation; Electrical Engineering; Elektro- och systemteknik;

    Abstract : The core of a power transformer can weigh hundreds of tons, and represents a significant part of the total ownership cost of the transformer, in terms of both the construction cost and of the monetary cost of losses. It is therefore desirable to have a method of diagnosing the core to ensure optimal performance, and to enable the operator to plan repairs of damaged or defective cores. READ MORE

  3. 3. Continuous-Time Delta-Sigma Modulators for Ultra-Low-Power Radios

    University dissertation from Department of Electrical and Information Technology, Lund University

    Author : Dejan Radjen; Lunds universitet.; Lund University.; [2014]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; continuous-time; Delta-Sigma; analog-to-digital; ultra-low-power; clock jitter; single operational amplifier; SAR quantizer;

    Abstract : The modern small devices of today require cheap low power radio frequency (RF) transceivers that can provide reliable connectivity at all times. In an RF transceiver, the analog-to-digital converter (ADC) is one of the most important parts and it is also one of the main power consumers. READ MORE

  4. 4. Differential Protection for Arbitrary Three-Phase Power Transformers

    University dissertation from Department of Industrial Electrical Engineering and Automation, Lund Institute of Technology

    Author : Zoran Gajic; Lunds universitet.; Lund University.; [2008]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; power transformers; electric power systems; differential protection; power system protection;

    Abstract : This thesis describes how to provide standardized, current based, differential protection for any three-phase power transformer, including phase-shifting transformers with variable phase angle shift and transformers of all construction types and internal on-load tap-changer configurations. The use of standard transformer differential protection for such applications is considered impossible in the protective relaying standards and practices currently applied. READ MORE

  5. 5. Wideband Sigma-Delta Modulators

    University dissertation from Stockholm : KTH

    Author : Xiaolong Yuan; KTH.; [2010]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; sigma-delta modulator; feedforward; reconfigurable; quadrature bandpass filtering; TECHNOLOGY Electrical engineering; electronics and photonics Electronics; TEKNIKVETENSKAP Elektroteknik; elektronik och fotonik Elektronik;

    Abstract : Sigma-delta modulators (SDM) have come up as an attractive candidatefor analog-to-digital conversion in single chip front ends thanks to the continuousimproving performance. The major disadvantage is the limited bandwidthdue to the need of oversampling. READ MORE