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 36 for “"2 GHz"”.
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A low dispersion 2-GHz comparator
A low dispersion 2-GHz comparator is an essential part of the latest automated VLSI tester by Teradyne Inc. With each new and faster CMOS logic VLSI microchips, faster and more precise comparators are needed to verify that the static discipline is being met on the many pins of the integrated …
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Power conservation and performance analysis of mobile ad hoc wireless networks
… to be operating at frequencies greater than 2 GHz and most of the research work in the area has been done in the frequency range of 1-2 GHz. In this thesis, a power conservation model is proposed. The proposed model is based on the conventional on-demand ad hoc routing protocols with the …
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Power supply switching for a mm-wave asymmetric multilevel outphasing power amplifier system
… discrete levels at a maximum sampling rate of 2 GHz. This modulation results in a higher average system efficiency by reducing the outphasing angle between the phase paths. This work was designed in a 130-nm SiGe BiCMOS process.
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Minimum cell size for information capacity increase in cellular wireless network
… at carrier frequencies, f c = 0.9 and 1.8 GHz, cell size radii R > 1 km and basic path loss exponent α ≥ 2. The future and emerging wireless communication systems are expected to be operating at frequencies f c > 2 GHz (3.35 - 15.75 GHz), cell size radii R≤ 1 km and basic path loss exponent …
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Modeling of In(0.49)Ga(0.51)P/GaAs Heterojunction Bipolar Transistors for ADC and MMIC Circuit Design
… is presented that exhibits a tuning range of 2 GHz. The initial design procedure is described in detail. Several monolithic varactors are empirically assessed for their contribution to the phase noise. Preliminary results for coplanar resonator structures are presented. These are presented as a …
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Performance of defected ground structure for rectangular microstrip patch antenna
… to obtain the required parameter responses at 2 GHz. The proposed antenna is excited through the microstrip feed line which is connected directly to the patch antenna. RMPA of length 35.8462 mm and width 46.0721 is designed on the substrate dielectric material FR-4 having dielectric constant …
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Wideband high-power transmission line pulse transformers
… operates on a wide frequency bandwidth (.5-2 GHz) with minimal reflection or radiative loss (>1.5 dB loss across the frequency range for both in testing). Further, this work touches on a future project that faces similar challenges under different requirements, and describes how these projects …
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1-Gs/s, 14-Bit Digital -to -Analog Converter and Track -and -Hold Amplifier
… 5. The THA circuit was also designed using a 60-GHz fT InGaP/GaAs HBT technology. Simulation results are 83-dB SFDR at 100-MHz sampling frequency, 65-dB SFDR at 1-GHz sampling frequency, and 60-dB SFDR at 2-GHz sampling frequency under all Nyquist conditions.
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Development of a frequency-domain electromagnetic scattering measurement system
… was installed to cover a frequency range of 2 GHz to 18 GHz. An HP-82300C BASIC Language Processor was installed on a COMPAQ Deskpro-386 PC, and an HP-BASIC program was developed for remote control of the HP-8510B with data acquisition over the HPIB bus. A post- processing algorithm was created …
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Amplifier Architectures for Wireless Communication Systems
… is a wideband low-noise amplifier operating at 2 GHz with a high power BJT. The proposed design uses only distributed elements to realize the input and output matching networks. Additionally, a passive DC bias network is used instead of an active DC bias network to avoid possible complications due …
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High repetition rate mode-locked erbium-doped fiber lasers with complete electric field control
… a low-noise, repetition rate multiplied 2 GHz source is demonstrated. Stabilization systems for high repetition rate sources must also be developed. Carrier envelope offset locking experiments using self-referencing techniques at 200 MHz repetition rate are described. Initial demonstrations …
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Resonator sensors integrated in bandpass filters for the detection and attenuation of interfering signals
… method employs a combline bandpass filter at 2 GHz center frequency at 5% bandwidth, which was designed on Advanced Design System (ADS) software and space mapping was performed to optimize the parameters. By weakly coupling the resonator to the filter, the interference signal of certain …
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A statistical ultra wideband indoor channel model and the effects of antenna directivity on multipath delay spread and path loss in ultra wideband indoor channels
… measurements have been performed in the 2 GHz to 6 GHz frequency band using three different transmitter/receiver (Tx/Rx) antenna combination pairs. The effects of antenna directivity on path loss and multipath propagation in the channel were analyzed extensively for various omni-directional …
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A UHF Multimode Array Feed for the Westford Radio Telescope
… frequencies simultaneous with reception from 2 GHz to 14 GHz. To demonstrate the capabilities of the MMAF, real-time calibration and beamforming techniques are developed, and the MMAF is used to adaptively steer the beam of the Westford Telescope to follow the downlink signal from MITs DeMi …
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A continuous-wave second harmonic gyrotron oscillator at 460 GHz
… report the short pulse and CW operation of a 460 GHz gyrotron oscillator both at the fundamental (near 230 GHz) and second harmonic (near 460 GHz) of electron cyclotron resonance. During operation in a complete CW regime with 12.4 kV beam voltage and 135 mA beam current, the gyrotron generates a …
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Analysis And Design Of Low Profile Multiband Multifunctional Antenna Arrays
… of a tri-band array comprised of an x-band (12 ghz) microstrip patch array on a superstrate above printed dual-band (1 and 2 ghz) slot loop antenna arrays in an octave-spaced lattice. The selection of a ground backing reflector is considered for improved gain and system packaging, but restricts …
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Archimedean spiral antenna embedded with frequency selective surface for wideband applications
… pattern and wideband antenna ranging from 3.1 GHz to 10.6 GHz. An Archimedean spiral antenna is the most potential candidate in the above mentioned applications as the antenna meets most of the above requirements. However, the practical implementation of spiral antenna is challenged by its …
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Dynamic amplifiers for analog-to-digital converters
… dynamic range (SFDR) at 4 GS/s with a 2 GHz input. Second, a study is conducted and a fully digital technique is proposed to calibrate the offset of interpolating flash ADCs. Compared to the state-of-the-art, this technique requires fewer comparators and needs fewer sets of input …
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Nanophotonic Optomechanical Devices for Torque Magnetometry
… of up to 500 MHz/nm and dispersive coupling of 2 GHz/nm, enables measurement of sub-pg torsional and cantilever-like mechanical resonances with a thermally-limited torque detection sensitivity of 1.2 ×10−20 Nm/sqrt(Hz) in ambient conditions. Tuning of both dissipative and dispersive optomechanical …
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Q-Enhanced LC Resonators for Monolithic, Low-Loss Filters in Gallium Arsenide Technology
… for a 60 MHz, -3 dB bandwidth centered at 1.88 GHz, corresponding to the North American PCS transmit band. The best filter design achieves 0 dB of passband insertion loss while consuming 16 mA of current from a 3 V source (48 mW). Passband gain (up to 15 dB) can be achieved with increased bias …
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