Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 23 for “"power added efficiency"”.
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Multidimensional power amplifier circuit optimizations for adaptive radar.
… to dynamically reconfigure radar transmitter power amplifiers will become necessary for adaptive radar. Reconfigurable transmitters will require the ability to tune input parameters such as load impedance, waveform bandwidth, and amplifier bias voltage to provide excellent performance while …
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Design and integration of hybrid and monolithic microwave power amplifiers for wideband applications using gallium nitride technology
… methods of realizing broadband microwave power amplifiers (PAs) up to 40 GHz with high efficiency using gallium nitride (GaN) technology. The studied architectures are based on the reactive/resistive matching approach and the traveling wave technique in both hybrid and monolithic microwave …
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Efficiency Enhancement of Base Station Power Amplifiers Using Doherty Technique
The power amplifiers are typically the most power-consuming block in wireless communication systems. Spectrum is expensive, and newer technologies demand transmission of maximum amount of data with minimum spectrum usage. This requires sophisticated modulation techniques, leading to wide, dynamic …
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Silicon-Based PALNA Transmit/Receive Circuits for Integrated Millimeter Wave Phased Arrays
… in meeting system performance and size/weight/power (SWAP) requirements. This work demonstrates a loss-aware methodology for analysis and design of switchless transmit/receive (T/R) circuits. The methodology provides design insights and a practical, generally applicable approach for solving the …
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A 77GHz power amplifier in silicon germanium BiCMOS technology
… and design of a 2-stage cascoded class-AB 77GHz power amplifier that could be used for imaging applications. Simulation results show a maximum output power of 20dBm, 26dB gain, and a maximum power-added efficiency (PAE) of 16%.
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Energy efficient radio frequency system design for mobile WiMax applications. Modelling, optimisation and measurement of radio frequency power amplifier covering WiMax bandwidth based on the combination of class AB, class B, and C operations.
… technology accounts for 3% and 2% of the global power consumption and CO2 emissions respectively. This alarming figure is on an upward trend, as future telecommunications systems and handsets will become even more power hungry since new services with higher bandwidth requirements emerge as part …
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A nonlinear statistical MESFET model using low order statistics of equivalent circuit model parameter sets
… with measured results. A single stage GaAs power amplifier tuned at 13.5 GHz is simulated with the model and accurately predicts output power, input return loss, and power added efficiency. Not only is nominal performance good, but the spreads of amplifier performance seen over many wafers …
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Deeply scaled CMOS for RF power applications
… In this regard, the integration of the power amplifier (PA) function becomes an increasing challenge as technology geometries and supply voltages scale down. Gate length (Lg) scaling yields improved frequency response, promising higher power-added efficiency (PAE), a key RF PA …
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High efficiency switching CMOS power amplifiers for wireless communications
High-efficiency performance is one of the most important requirements of power amplifiers (PAs) for wireless applications. However, the design of highly efficient CMOS PAs for watt-level applications is a challenging task. This dissertation focuses on the development of the design method for highly …
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Effect of varying gate-drain distance on the RF power performance of pseudomorphic high electron mobility transistors
… radar, cellular telephones, and other RF power applications. One key figure of merit in these applications is RF power output. Increasing the gate-to-drain length (LRD) of the PHEMT leads to an increase in its breakdown voltage. This should theoretically allow the selection of a higher …
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Gallium Nitride-Based HEMTs for Microwave Power and Noise: Physics and Application
… high speed performance, both high microwave power and low microwave noise. In this dissertation, the millimeter-wave and microwave power performance and small signal and low noise microwave characteristics are investigated. The CW power performance at 20 GHz and 30 GHz of 0.25 mum x 100 mum …
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Characterization of various types of power amplifiers
… RFIC manufacturers. In all RF transceivers, the power amplifier plays a key role in driving the antenna on the transmitting end, while low-noise amplifier boosts the receiving end signal. Together these components account for the basic operation of a duplexed system. Among the various …
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Efficiency enhancement techniques for RF and millimeter wave power amplifiers
Power amplifiers are the circuit blocks in wireless transceivers that require the largest power budget because of their relatively low efficiencies. RF designers cannot depend solely on the development better semiconductor devices in advanced deeply scaled process technologies to obtain improved …
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Gallium nitride class-F power amplifier for UMTSWCDMA applications
… standard for mobile communications. Power amplifiers are the most power consuming unit in wireless communication systems. The power amplifiers used in UMTS devices need to be highly efficient. Improved efficiency not only extends the battery life but also reduces the DC power …
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Class-F Power Amplifier with Maximized PAE
… operating speeds are getting faster and more power is being consumed by those devices. Therefore, there is a big concern on how to prolong the battery life in order to fit consumers’ needs. Power amplifiers (PA) at the front end of wireless equipment have drawn a big concern from engineers …
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Design of Class-E Radio Frequency Power Amplifier
Power amplifiers (PA) are typically the most power-consuming building blocks of RF transceivers. Therefore, the design of a high-efficiency radio frequency power amplifier is the most obvious solution to overcoming the battery lifetime limitation in the portable communication systems. A power …
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Amplifier Architectures for Wireless Communication Systems
… amplifiers. On the transmitter side, enhanced efficiency and broader bandwidth over single and multiple bands on power amplifiers will help to have superior performance in communication systems. On the other hand, for the receiver side, having low noise and high gain will be necessary to ensure …
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CMOS Power Device Modeling and Amplifier Circuits
A power amplifier (PA) is a key part of the RF front-end in transmitters for a local broadband network. Today, commercial PAs are made of III-V HEMT and HBT technology with excellent results. An integrated system-on-chip power amplifier circuit using CMOS technology for cost-effective and …
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Performance limits of RF power CMOS
… CMOS radios at 60 GHz. However, the design of power amplifiers in CMOS still remains a significant challenge because of the low breakdown voltage of deep submicron CMOS technologies. Power levels from 60 GHz power amplifiers have been limited to around 15 dBm with power-added efficiencies in …
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Efficiency Improvement of WCDMA Base Station Transmitters using Class-F power amplifiers
… such as QPSK need, in turn, a very linear power from the output of the transmitter power amplifier in order to meet the spectral requirements. A linear power amplifier, traditionally, has very low energy efficiency. Poor energy efficiency directly affects operational costs and causes …
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