FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W51928844> ?p ?o ?g. }

• W51928844 abstract "The increasing use of mobile networks as the main source of internet connectivity is creating challenges in the infrastructure. Customer demand is a moving target and continuous hardware developments are necessary to supply higher data rates in an environmentally sustainable and cost effective way. This thesis reviews and advances the status of realizing wideband and high efficiency power amplifiers, which will facilitate improvements in network capacity and energy efficiency. Several demonstrator PAs are proposed, analyzed, designed, and characterized: First, resistive loading at higher harmonics in wideband power amplifier design suitable for envelope tracking (ET) is proposed. A 40 dBm decade bandwidth 0.4–4.1 GHz PA is designed, with 10–15 dB gain and 40–62% drain efficiency. Its versatility is demonstrated by digital pre-distortion (DPD) linearized measurements resulting in adjacent channel leakage ratios (ACLR) lower than −46 dBc for various downlink signals (WCDMA, LTE, WiMAX). Second, a theory for class-J microwave frequency dynamic load modulation (DLM) PAs is derived. This connects transistor technology and load network requirements to enable power-scalable and bandwidth conscious designs. A 38 dBm PA is designed at 2.08 GHz, maintaining efficiencies >45% over 8 dB of output power back-off (OPBO) dynamic range. From this pre-study a fully packaged 86-W peak power version at 2.14 GHz is designed. ACLR after DPD is −46 dBc at a drain efficiency of 34%. For DLM PAs there is a need for varactors with large effective tuning range and high breakdown voltage. For this purpose, SiC Schottky diode varactors are developed with an effective tuning range of 6:1 and supporting a 3:1 tuning ratio at 36 V of RF swing. Nonlinear characterization to enable Q-factor extraction in the presence of distortion is proposed and demonstrated by multi-harmonic active source- and load-pull, offering insights to tunable network design. Third, a method to evaluate and optimize dual-RF input PAs, while catering to higher harmonic conditions and transistor parasitics, is proposed. The method is validated by a PA design having a peak power of 44 +/- 0.9 dBm and 6 dB OPBO PAE exceeding 45% over a 1–3 GHz bandwidth. The results in this thesis contribute with a novel device and analysis of high efficiency and wideband PAs, aiding in the design of key components for future energy efficient and high capacity wireless systems." @default.
• W51928844 created "2016-06-24" @default.
• W51928844 creator A5065642759 @default.
• W51928844 date "2013-01-01" @default.
• W51928844 modified "2023-09-23" @default.
• W51928844 title "High Efficiency Microwave Amplifiers and SiC Varactors Optimized for Dynamic Load Modulation" @default.
• W51928844 cites W1491885026 @default.
• W51928844 cites W1502048127 @default.
• W51928844 cites W1510852496 @default.
• W51928844 cites W1513140202 @default.
• W51928844 cites W1522234221 @default.
• W51928844 cites W1524200965 @default.
• W51928844 cites W1540576515 @default.
• W51928844 cites W1565235666 @default.
• W51928844 cites W1569385444 @default.
• W51928844 cites W1571918462 @default.
• W51928844 cites W1574794278 @default.
• W51928844 cites W1592410841 @default.
• W51928844 cites W1604561029 @default.
• W51928844 cites W1604581218 @default.
• W51928844 cites W161028521 @default.
• W51928844 cites W1685290521 @default.
• W51928844 cites W169421639 @default.
• W51928844 cites W1704335793 @default.
• W51928844 cites W1765671407 @default.
• W51928844 cites W1824894073 @default.
• W51928844 cites W1917859800 @default.
• W51928844 cites W1951324077 @default.
• W51928844 cites W1965817159 @default.
• W51928844 cites W1971291082 @default.
• W51928844 cites W1973263430 @default.
• W51928844 cites W1980187274 @default.
• W51928844 cites W1982863483 @default.
• W51928844 cites W1983607641 @default.
• W51928844 cites W1984106720 @default.
• W51928844 cites W1985370019 @default.
• W51928844 cites W1992318339 @default.
• W51928844 cites W1995496049 @default.
• W51928844 cites W1998175657 @default.
• W51928844 cites W1998424088 @default.
• W51928844 cites W1999195298 @default.
• W51928844 cites W2000080820 @default.
• W51928844 cites W2001975938 @default.
• W51928844 cites W2002971582 @default.
• W51928844 cites W2011288192 @default.
• W51928844 cites W2013714470 @default.
• W51928844 cites W2015637525 @default.
• W51928844 cites W2015709883 @default.
• W51928844 cites W2018691840 @default.
• W51928844 cites W2020916545 @default.
• W51928844 cites W2020973266 @default.
• W51928844 cites W2022349818 @default.
• W51928844 cites W2023503490 @default.
• W51928844 cites W2026305205 @default.
• W51928844 cites W2029236098 @default.
• W51928844 cites W2033577134 @default.
• W51928844 cites W2034042738 @default.
• W51928844 cites W2034250901 @default.
• W51928844 cites W2034290925 @default.
• W51928844 cites W2034823700 @default.
• W51928844 cites W2036015442 @default.
• W51928844 cites W2039687986 @default.
• W51928844 cites W2041486610 @default.
• W51928844 cites W2043463741 @default.
• W51928844 cites W2044100330 @default.
• W51928844 cites W2047043550 @default.
• W51928844 cites W2047138093 @default.
• W51928844 cites W2048465855 @default.
• W51928844 cites W2058492860 @default.
• W51928844 cites W2058878299 @default.
• W51928844 cites W2063436222 @default.
• W51928844 cites W2066329376 @default.
• W51928844 cites W2066560481 @default.
• W51928844 cites W2066644507 @default.
• W51928844 cites W2067742614 @default.
• W51928844 cites W2070098786 @default.
• W51928844 cites W2070354155 @default.
• W51928844 cites W2070565573 @default.
• W51928844 cites W2071764754 @default.
• W51928844 cites W2076554460 @default.
• W51928844 cites W2077365252 @default.
• W51928844 cites W2077735327 @default.
• W51928844 cites W2077988461 @default.
• W51928844 cites W2078440026 @default.
• W51928844 cites W2078588266 @default.
• W51928844 cites W2078862961 @default.
• W51928844 cites W2079911326 @default.
• W51928844 cites W2084174301 @default.
• W51928844 cites W2085960933 @default.
• W51928844 cites W2086699975 @default.
• W51928844 cites W2089072925 @default.
• W51928844 cites W2089768688 @default.
• W51928844 cites W2090250376 @default.
• W51928844 cites W2091780553 @default.
• W51928844 cites W2093487934 @default.
• W51928844 cites W2095329283 @default.
• W51928844 cites W2095888593 @default.
• W51928844 cites W2095998148 @default.
• W51928844 cites W2096149630 @default.
• W51928844 cites W2096901972 @default.

• next