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Showing 1 to 20 of 34 for “"Power amplifier (PA)"”.
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Fast Adaptive Digital Pre-Distortion Scheme for Application in Cellular Base Station Power Amplifiers
In a base station, the power amplifier (PA) experiences rapid fluctuations in behavior because of the varying power levels and bandwidth of its excitation signals. High peak-to-average power ratios and nonconstant envelopes of wideband signals impose stringent linear and efficiency requirements on …
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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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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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A fully-integrated all-digital outphasing transmitter for wireless communications
… modulators (DPMs) to adaptively compensate for amplifier mismatches. As the DPM uses a digital input to directly modulate the RF phase of each path, the phase control becomes very simple and accurate for power amplifier (PA) gain/phase mismatch compensation. Furthermore, this digital phase …
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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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A High Temperature Wideband Power Amplifier for a Downhole Communication System
… these extreme temperatures. The proposed power amplifier (PA) has been designed for a downhole communication system operating at an ambient temperature of 230oC. GaN technology was chosen primarily due to its ability to function at a high junction temperature. The proposed PA was designed …
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MIMO-OFDM Symbol Detection via Echo State Networks
… WESN has an enhanced short-term memory (STM) compared with the standard ESN such that WESN can offer better computing ability. Additionally, the bandwidth spent as the training set is the same as the demodulation reference signals defined in 3GPP LTE/LTE-Advanced systems for the ESN/WESN based …
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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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Techniques for efficient radio frequency power conversion
A diverse range of radio-frequency (RF) power applications demand RF power generation systems that allow for dynamic output power control while having the capability to efficiently deliver power into a varying load. While some of these existing and emerging applications are characterized with …
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Glass Based Packaging for Beyond 5G Communication
… of this research is to develop advanced glass packaging technology to enhance the performance of RF front-end (RFFE) modules in the D-band (110 GHz to 170 GHz) for next-generation wireless communication (6G). The focus is on heterogeneous integration solutions for 140 GHz CMOS IC and Indium …
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Joint compensation of I/Q impairments and PA nonlinearity in mobile broadband wireless transmitters
… of in-phase/quadrature-phase (I/Q) impairments and power amplifier (PA) nonlinearity in wireless transmitters using accurate, low complexity digital predistortion (DPD) technique. After analysing the distortion created by I/Q modulators and PAs together with nonlinear crosstalk effects …
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Constant Conduction Angle Biasing for Class C Monolithic RF Power Amplifiers
… faraway user – base stations continually enforce power control. That is, nearby users must lower their transmit power. In CDMA technology, power control can be as large as 70-80dB. At low power outputs, this greatly impacts the performance of the RF power amplifier (PA) in the cellular device. For …
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Class-E Power Amplifiers in Modern RF Transmitters
Power amplifiers have been playing a vital role in most wireless communication systems. In order to improve efficiency of wireless systems, advanced transmitter architectures, such as Doherty amplifiers, outphasing amplifiers, supply voltage modulation techniques are widely used. The goal of this …
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Analog and Digital Co-design Methods for Future Wireless Transmitters
… to improve their performance with reduced power consumption. Work performed in this thesis aims at improving several key areas of a wireless transmitter architecture to be more efficient and reliant on their power consumption. A novel calibration technique based on constellation mapping of …
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Design and implementation of adaptive baseband predistorter for OFDM nonlinear transmitter. Simulation and measurement of OFDM transmitter in presence of RF high power amplifier nonlinear distortion and the development of adaptive digital predistorters based on Hammerstein approach.
… the dynamic nonlinear distortion of a High Power Amplifier (PA). The effectiveness of the proposed baseband predistorter (PD) on the performance of a WLAN OFDM transmitter utilizing a nonlinear PA with memory effect is observed and discussed. For this purpose, a 10W Class-A/B power amplifier …
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Architecture for ultra-low power multi-channel transmitters for Body Area Networks using RF resonators
… develops the specifications of a ultra-low power 2.4GHz transmitter for use in a Body Area Networks, taking advantage of the asymmetric energy constraints on the sensor node and the basestation. The specifications include low transmit output powers, around -10dBm, low startup time, simple …
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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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Analytical Modeling and Design of High-Efficiency Input-Output Harmonic Tuned Microwave Power Amplifiers
High efficiency power amplifier (PA) is an integral part of an efficient radio frequency (RF) transmitting system design. To enable modern and future wireless communication systems, the quest for efficient, wideband, and linear PA design techniques is ongoing. To cope with the stringent and …
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Power Consumption Optimization: A Cognitive Radio Approach
Power consumption is one of the most important aspects in mobile and wireless communications. Existing research has shown significant power reduction through limited radio reconfiguration based on the channel conditions, especially for short range sensor network applications. A cognitive radio (CR) …
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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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