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 35 for “"High linearity"”.
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High linearity broad-band helix TWTs
… These applications demand low spectral noise and high efficiency across a broad band. Research has been carried out to achieve these criteria in a helix TWT design. A deeper understanding has been gained on how the basic parameters of a TWT affect its non-linear performance. By selecting and …
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Investigation of high linearity DFB lasers for analog communications
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science; and, Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Physics, 1998.
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Multigate MOSFETs for digital performance and high linearity, and their fabrication techniques
… for multigate transistors, especially for III-V high mobility materials. It is also challenging to increase the fin aspect ratio by dry etching because of the non-ideal anisotropic etching profile. Here, we report a novel method, inverse metal-assisted chemical etching (i-MacEtch), in lieu of …
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Design and implementation of high linearity FPGA-TDCs and an integrated large scale TCSPC system for time-resolved applications
… research and many industry areas because of its high temporal resolution and sensitivity. Analogue-based conventional TCSPC systems have been commercialised and applied in scientific experiments widely. However, the complicated system of conventional TCSPC equipment causes the bulky size, high …
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CMOS integrated commutated circuits for interference filtering at radio-frequency
… The passive mixer-first architecture provides high linearity and reconfigurability. The acoustic load at intermediate frequency ensures good selectivity. Thereceiver operates at 3.5-to-6.2 GHz and achieves IIP3 of >+27 dBm at 1xBW offset with a minimum NF of 9.7 dB in measurement. For the …
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A Linear RF Power Amplifier with High Efficiency for Wireless Handsets
… 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 response. The …
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Modulation-Doped Field-Effect Transistors for High-Power Microwave Applications
… and sequential wet and dry selective etching. A high linearity of device characteristics is important to minimize intermodulation of high frequency signals under high-power operation. The linearity of device performance is investigated through the comparison of InGaAs/GaAs PHEMTs and doped …
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High-Speed, High-Precision Digital -Analog Converters Designed for Spectral Performance
… coupled to a current-switching DAC to extract a high-linearity signal from the current- switched output. Provision is also made for static calibration to correct for current-source mismatch and attain the correct static linearity; this is also required for attaining the desired dynamic linearity. …
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Silicon-based Microwave/Millimeter-wave Monolithic Power Amplifiers
There has been increased interest in exploring high frequency (mm-wave) spectrum (particularly the 30 and 60 GHz ranges), and utilizing silicon-based technology for reduced-cost monolithic millimeter integrated circuits (MMIC), for applications such as WLAN, inter-vehicle communication (IVC) …
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A Linear and Efficient RF Amplifier Architecture for Modern Wireless Applications
… the effect of this envelope variation on highly nonlinear amplifiers, is presented, and a new method that minimizes the envelope variation and bandwidth of the signal components, named differential LINC (DLINC), is demonstrated. It is also shown that further improvement in the overall …
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2GHz W-CDMA Radio Transceiver
… control for combating the near-far problem. The high linearity of the transmitter provides the use of linear modulation with less than 40dBc adjacent channel power suppression. The 0.03125ppm tuning resolution of the AFC maximizes the receiver sensitivity. The 80dB AGC produces a constant …
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High-Resolution Nyquist -Rate Analog -to -Digital Converter
… been implemented in a CMOS technology to achieve high linearity and high speed. The capacitor error-averaging technique can perform an accurate multiply-by-two (x2) function required in high-resolution pipelined ADCs, while a high gain op-amp has been designed to minimize error due to finite DC …
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Front-end circuits for a photonic analog-to-digital converter
… resolution of electrical ADCs gets limited at higher sampling rates due to sampling clock jitter, low-jitter mode-lock laser based photonic ADCs are starting to gain more attention. As well as low-jitter and high-linearity operation at very high speeds, photonic ADCs provide the opportunity to …
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Investigation of Microwave Transducer for Linearity Dependence and Applications in Quantum Networking
… uni-traveling carrier photodiodes (UTC-PDs) for high-frequency operation, yet most do not have the high-speed and high-linearity performance or the ability to handle ultracold temperatures. To address these low-temperature and high-frequency problems, an RF photonic microwave transducer is used …
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Phase manipulation for efficient radio frequency transmission
… the most power-hungry element of a transmitter. High linearity is required for modern digital communications standards, and often is achieved at the expense of efficiency. Outphasing architectures, which combine multiple nonlinear but efficient switching PAs into a system with an overall linear …
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Scalable and Reconfigurable True-Time Delay Line for Integrated Radio-Frequency Recurrent Neural Processors
… low attenuation, low power consumption, high linearity, and have reconfigurable delay characteristics. The proposed solution utilizes compact integration, signal preservation along the delay line, and dynamic tuning for different carrier frequencies or true-time delay needs. A full model …
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A superconducting bandpass delta-sigma modulator for direct analog-to-digital conversion of microwave radio
… for digitizing narrowband signals with high linearity and a large signal-to-noise ratio (SNR). The design of a superconducting bandpass AE modulator presented here exploits several advantages of superconducting electronics: the high quality factor of resonators, the high sampling rates …
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Digitally-Assisted RF IC Design Techniques for Reliable Performance
… CMOS devices to attain benefits of low cost, high performance, and high integration density in digital integrated circuits. On the other hand, deep scaled technologies inextricably accompany a large process variation, supply voltage scaling, and reduction in breakdown voltages of transistors. …
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A systematic methodology to improve CMOS transductors for low power and wideband operation
… of the main current signal processing system, high-performance transconductor structures need to be designed. The major concerns of modern analog systems include lower power dissipation and wider bandwidth in addition to the application related performances, such as, high gain, high linearity …
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