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 15 of 15 for “"RF transmitter"”.
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Digitally enhanced CMOS RF transmitter with integrated power amplifier
An energy-efficient, 3.5 GHz, direct-conversion 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 …
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Architecture and design of an RF receiver front-end and transmitter for wireless sensor networks, healthcare and smart energy systems
… for ubiquitous wireless communications utilizing RF transceivers which consume the lowest possible energy. The thesis focuses on the architecture, design, implementation and evaluation of an RF transmitter and receiver front-end which are part of the foundations of a commercial RF system on a …
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NOVEL PARALLEL TRANSMIT SYSTEMS FOR MRI APPLICATIONS
In this work a new RF transmitter design is presented for MRI parallel transmissionapplications. Benchtop measurements and imaging experiments were performed withdifferent prototypes to prove system’s performance and potential advantages versus asystem based on conventional MRI RF hardware. The …
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A hierarchical bottom-up, equation-based optimization design methodology
We have implemented a segment of an RF transmitter signal chain in discrete components using bipolar transistors. We formulated both a broadband amplifier and mixer as mathematical programs (MP) and extracted Pareto-optimal (PO) [1-3] tradeoff surfaces. Abstracting these PO surfaces in place of the …
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Development of a wireless sensor unit for tunnel monitoring
… of a sensor device, microcontroller, ADC and RF transmitter. The integration of these components is described in detail. Deployment details and some preliminary results are presented.
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Energy efficient RF communication systems for wireless microsensors
… communication protocol and implementation of the RF transmitter. In the first part of the thesis, energy efficient communication protocols for a coordinated static sensor network are proposed. A detailed communication energy model, obtained from measurements, is introduced that incorporates the …
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A concept for wildlife tracking using ultra high frequency (UHF) radio
… (UHF) with a frequency 315MHz is used as a transmitter. While a encoder HT12E is used as a function of generate a data signal to the RF Transmitter module 315MHz to transmit. The signal sent by the transmitter detected by Yagi antenna as a receiver and was designed at a frequency of 315MHz …
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Design and analysis of artifact-resistive finger photoplethysmographic sensors for vital sign monitoring
… and the data is sent to a host computer via a RF transmitter. Two major design issues are addressed: one is to minimize motion artifact and the other is to minimize the consumption of battery power. An efficient double ring design is developed to lower the influence of external force, …
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Compact Digital Predistortion for Multi-band and Wide-band RF Transmitters
… and least-square (LS) based algorithms can be performed with any sampling-rate of feedback samples. The principle, implementation and practical concerns of the undersampling DPD which uses lower sampling-rate ADC are then introduced. Finally, the observation bandwidth of DPD systems can be …
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A Robust Power-Scalable Transmitter Architecture for Wireless Body Area Networks
In this dissertation, an RF transmitter is presented that uses closed-loop PLL- based BFSK modulation and is reconfigurable for both the MedRadio and 433 MHz ISM bands. A power efficient class-C amplifier is utilized and the design methodologies for designing a highly efficient and low-power …
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Low Power Cmos Circuit Design And Reliability Analysis For Wireless Me
… an analog to digital converter and a wireless transmitter is designed to implement the proposed system. In the architecture of the 'AccuMicroMotion' system, the readout circuit uses chopper stabilization technique and can resolve DC to 1 KHz and 200 nV signals from MEMS transducers. The base …
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Multiband RF/Microwave Front-end Receiver Design for Multi-Standard Applications
… for high integration design. Compared to the RF transmitter, the design of the RF receiver front end is considered to be more challenging due to the increased signal interference/noise in the communication path, which often can be neglected in transmitter design due to the large discrepancy …
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Analysis and design of ΣΔ Modulators for Radio Frequency Switchmode Power Amplifiers
… contributes to unwanted power dissipation in a transmitter. Recently, a switchmode power amplifier operation was considered for reducing power losses in a RF transmitter. A linear and efficient operation of a PA can be achieved when the transmitted RF signal is ΣΔ modu- lated, and subsequently …
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Power management circuits for ultra-low power systems
Power management circuits perform a wide range of vital tasks for electronic systems including DC-DC conversion, energy harvesting, battery charging and protection as well as dynamic voltage scaling. The impact of the efficiency of the power management circuits is highly profound for ultra-low …
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Circuit Techniques for Multiple and Wideband Beamforming
… different designs are implemented in TSMC 65nm RF CMOS to demonstrate different solutions. The design in this thesis have included major RF blocks in state-of-art wireless transceiver: RF receiver, local oscillator, and RF transmitter. First, a RF/analog FFT based four-channel four-beam receiver …