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 12 of 12 for “"Image Rejection"”.
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Concept Demonstrator for MeerKAT Operation from 14.5 to 20 GHz
… and custom designed microstrip filters for image rejection and anti-aliasing. Laboratory measurements of the receiver show a maximum gain of 76 dB, 40 dB image rejection and 27 dB spurious free dynamic range (SFDR). The simulated noise figure of the system using the measured noise figure of …
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A FIR Filter Embedded Millimeter-wave Front-end for High Frequency Selectivity
… proposed FIR filtered receiver achieves > 40-dB image rejection by placing an image signal at the null frequency at D-band, one of the largest image rejection performance at the highest frequency band reported so far.
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Conversor DSB-SSB a capacitores chaveados por transformador de Hilbert em tecnologia CMOS de 180 nm
… experimental results show the converter achieves Image Rejection Ratio (IRR) greater than 39.5 dB for Lower-Sideband (LSB) modulation and 38.0 dB for Upper-Sideband (USB) modulation for input signals ranging from 25% to 75% of the carrier frequency. These figures are higher than previous analog …
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Time-Varying Frequency Selective IQ Imbalance Estimation and Compensation
… problems of DDC transceivers that limits their image rejection capabilities. Compensation techniques for frequency independent IQI arising due to gain and phase mismatches of the mixers in the I/Q paths of the transceiver have been widely discussed in the literature. However for wideband …
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Design and Characterization of RFIC Voltage Controlled Oscillators in Silicon Germanium HBT and Submicron MOS Technologies
… (I/Q) downconversion signal recovery and image rejection. Any imbalance between the I and Q channels can result in an increase in bit-error-rate (BER) and/or decrease in the image rejection ratio (IRR). To compensate for such an imbalance, an integrated tunable polyphase filter is …
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Twin-image problems in optical scanning holography
… part of this dissertation investigates twin-image noise in optical scanning holography. In optical scanning holography, holographic information of an object is generated by 2-D active optical scanning. The optical scanning beam can be a time-dependent Gaussian apodized Fresnel zone pattern. …
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A 5-6 Ghz Silicon-Germanium Vco With Tunable Polyphase Outputs
… recovery in direct conversion receivers, or image rejection. If imbalance between the I and Q channels exists, the bit-error-rate (BER) of the transceiver and/or the image rejection ratio (IRR) will quickly deteriorate. Methods for correcting I/Q imbalance are desirable and necessary to …
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Scaled Synthetic Aperture Rader Development
… power supplies, an oscilloscope, and control and image processing software. This thesis covers the design and evaluation of the analog/radio frequency (RF) front end circuitry and signal processing software.</p> <p>RF amplifier integrated circuits (ICs) were evaluated for two purposes: increasing …
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Integration of broadband direct-conversion quadrature modulators
… carrier. The close-lying mirror, or image, sideband will be eliminated either by the filtering method or by the phasing method. Since filter Q-values rise in direct relation to the transmitted frequencies, the filtering method is generally not feasible for integrated microwave …
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Filter Design for Interference Cancellation for Wide and Narrow Band RF Systems
… channel selection, interference cancellation, image rejection, etc. These are all translated in selecting the wanted signal while mitigating the rest. This can be performed by either selecting the desired frequency range by a band pass filter or rejecting the unwanted part by a band stop …
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The Analysis and Design of Phase-tunable Low-Power Low-Phase-Noise I/Q Signal Sources for Analog Phase Calibrated Transceivers
… of system-on-chip wireless transceivers, the image-reject, zero-IF and low-IF receiver architectures have become the main topologies used in mainstream wireless communication systems. Consequently, signal sources with quadrature phase outputs [quadrature oscillators (QOs)] are therefore …
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Impedance- and spatial-domain aliasing in interference management techniques
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-12-01