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Showing 1 to 6 of 6 for “"Quadrature Modulator"”.
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Integration of broadband direct-conversion quadrature modulators
… for integrated microwave transmitters. A quadrature modulator realizes the phasing method by combining signals phased at quadrature (i.e. at 90° offsets) to produce a single-sideband (SSB) output. In this way output filtering can be removed or its specifications greatly relieved so as to …
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Dynamic Range Analysis and High-Speed Integrated Circuit Designs Using Indium Phosphide HBT Technology
… and +/-2-dB log accuracy. The other circuit is a quadrature modulator, which operates at 1 G ∼11 GHz. Good carrier rejection of -30 dB and third-order harmonic suppression of -56 dB have been achieved with competitive output power over the other published results.
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Genetic algorithm design and testing of a random element 3-D 2.4 GHZ phased array transmit antenna constructed of commercial RF microchips
… a unique and innovative application of a quadrature modulator microchip used in commercial communications applications. Corroboration of predicted beam patterns from both Genetic Algorithm and Method of Moments calculations was achieved in anechoic chamber measurements conducted with the …
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A digital up-conversion architecture for future high efficiency wireless base stations
… to analog converters, reconstruction filters, quadrature modulator and local oscillators. Digital signal processing techniques used for signal modulation are extended to digital up-conversion to generate suitable drive signals for the SMPA. In this thesis, a sigma-delta (ΣΔ) based technique is …
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Techniques for low coherence pulsed Doppler lidar
… to the currently favoured acousto-optic modulator. The first approach presented is a design in which a sample of the transmitted pulse is stored in a fibre optic ring resonator of pathlength longer than the pulse. Each time the pulse circulates the storage loop a fraction is split off and …
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Wideband direct conversion IQ modulators in indium phosphide DHBT technology
… performance enhancements might be seen in IQ modulator circuits using an InP DHBT process. During the course of investigating this question, I focused on designing a direct conversion IQ modulator that could be useful across the full bandwidth of existing vector signal generators and also …