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 175 for “"Power amplifier"”.
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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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Broadband and Energy-Efficient Power Amplifier Architectures
In this dissertation, power amplifier circuits and architectures are proposed that provide high efficiency for spectral-efficient high peak-to-average power ratio signals that are being used in modern communications systems. Using the proposed amplifier architectures and circuits high efficiency …
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New architecture for RF power amplifier linearization
Power amplifier linearization has become an important part of the transmitter system as 3G and developing 4G communication standards require higher linearity than ever before. The thesis proposes two power amplifier linearization solutions : two-point architecture and adaptive digital predistortion …
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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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Distributed scalable model for CMOS FET power amplifier
… is mature. Unfortunately, communications power amplifiers have been scarce, due to the electrical advantages provided by III-V semiconductors. In order to reach similar power levels, power amplifiers implemented on silicon require larger transistors. It is common practice to create such …
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RF power amplifier linearity compensation for MRI systems
… linearization system for use with MRI RF power amplifiers was designed and simulated. The design here presented is intended to replace Analogic's (located in Peabody, Massachusetts) feed-forward, digital linearization scheme. This involved the selection and testing of components meeting …
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Linearization of a pulse width modulated power amplifier
… moving towards an integrated CMOS solution for power amplifiers. Cheaper phones for consumers and better bottom lines for companies are the result of this. The goal of this thesis is to investigate the use of pulse width modulation in a high efficiency integrated CMOS power amplifier for a …
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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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Digitally-assisted, efficiency enhanced, linear RF power amplifier architectures
… development of efficiency enhanced, linearized power amplifier (PA) architectures. In this research, digital enhancements are used to boost the efficiency of a dual-input LDMOS Doherty PA of 500W peak power. It is shown that the improved phase adjustment and the waveform conditioning for the …
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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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Digitally enhanced CMOS RF transmitter with integrated power amplifier
… RF transmitter with integrated 23 dBm, Class-B power amplifier (PA) is fabricated in a 0.13 μm CMOS process. The TX chip is packaged using a low-cost chip-on-board (COB) technique. When 20-MHz bandwidth OFDM signals are transmitted, a high TX average power efficiency is achieved exploiting 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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Design of RF CMOS Power Amplifier for UWB Applications
… level implementation of key RF blocks like the power amplifier (PA), transmit/receive switch, low noise amplifier (LNA) and mixers in an UWB transceiver. Though expensive technologies like SiGe or GaAs have been used for transceiver realizations, the ultimate goal is to have a single-chip, …
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The Design of Linearized Power Amplifier for Wireless Communications
… big challenge on the linearity requirement of Power Amplifiers, PAs. The simplest technique that has been used is backing off the PA. However, this leads to very inefficient performance. A lot of more complex techniques were suggested in the literatures to trick the tradeoff between linearity …
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Broadband RF Power Amplifier Design Methodology Using Sequential Harmonic Characterization
Radio Frequency Power Amplifier (RFPA) amplifies the communication signals to the required power level for transmission. It is the most power consuming stage in a transceiver chain; consequently, any improvement in terms of dissipated power and efficiency of the power amplifier affects the overall …
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Efficient, low-distortion switch-mode power amplifier for amplitude modulation
… low-level signals are usually not of adequate power to transmit the desired information across a target medium, thus requiring modulation and power amplification. In general, two goals of power amplifier design are low-distortion and high-efficiency. To meet these goals, a unique switch-mode …
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A class-D-tracking-rail class-A audio power amplifier
A tracking-rail power audio amplifier was designed and partially implemented to deliver up to 100W into an 8Q load with very low signal distortion and high power efficiency. The design uses a class-A amplifier, known for its low signal distortion but low power efficiency (less than 50%), to amplify …
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Diode Predistortion Linearization for Power Amplifier RFICs in Digital Radios
… This trend presents the need for compact and power efficient radio systems. Typically, the most power inefficient device in a radio system is the power amplifier (PA). PA inefficiency requires increased battery reserves to supply the necessary DC bias current, resulting in larger devices. …
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A Linear RF Power Amplifier with High Efficiency for Wireless Handsets
… research presents design techniques for a linear power amplifier with high efficiency in wireless handsets. The power amplifier operates with high efficiency at the saturated output power, maintains high linearity with enhanced efficiency at back-off power levels, and covers a broadband frequency …
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Design of Power Amplifier Test Signals with a User-Defined Multisine
… to the transmission and reception of signals. Power amplifier (PA) is a crucial element in base station assembly. PAs are expensive, take up space and dissipate heat. Of all the elements in the base station, it is difficult to design and operate a power amplifier. New designs of power …
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