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A tri-band (bands I, II, V/VIII) single-chip RFIC has been designed in 0.18 ??m SiGe BiCMOS process to meet HSDPA Category 8 requirements. Competitive radio RF performance necessitates optimum tradeoff of design challenges. The transceiver relies on front-end SAW filters for increased system performance margins. Calibration schemes for receive DC offset, transmit carrier leakage, and VCO frequency...
A multi-band (bands I, II, V, VIII [option]) single-chip RFIC has been implemented in 0.18 mum SiGe BiCMOS process for WCDMA/HSDPA applications. The direct-conversion receiver achieves competitive system performance: -110.5dBm sensitivity, 20 dB and 12 dB blocking margin for ACS case 1 and case 2, respectively, and excellent in-band blocking margins. The direct-modulation transmitter achieves more...
On the basis of effective extraction and utilization of transient fault information, this paper presents a whole scheme of ultra- high-speed transient based protection for EHV/UHV transmission lines, which consists of the main protection, the auxiliary protection and related protection elements. All protection elements are introduced, including starting element, directional element, boundary element,...
Despite the critical need for an open architecture in decision support system (DSS) design, present DSS architectural design are unable to provide a fundamental solution to enhance the flexibility, connectivity, compatibility, and intelligence of a DSS. In this paper, we present a novel multi-agent-based architecture for DSS, called agent-based open connectivity for decision support systems (AOCD)...
Rogowski coils are increasingly used to measure AC current or transient current in power industry. Thermal expansion can change the cross-sectional area of the coils when the ambient temperature varies. In order to evaluate the thermal expansion effect on Rogowski coils, two factors are proposed, which can be described as the ratio error of induced voltage per unit rise in temperature of the coils...
A grating-coupled surface-emitting mid-IR optical pre-amplifier was fabricated from a quantum cascade laser wafer and demonstrated >15-dB small signal gain with ASE power <-44 dBm. The Bragg grating served as output-coupler, ASE-filter, and wavelength division multiplexer.
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