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This paper presents a smart badge system for managing museum visitors and improving their viewing experience. The badge uses a LoRa wireless interface for two-way long-distance communication with tour guides and the museum’s control center. The control center can collect information such as the visitors’ viewing preferences, location, and status of activity level, enabling it to wirelessly send suggestions...
A Short-wave ultra-wideband balanced amplifier with high linearity and lower noise based on balanced structure is presented. The amplifier is realized by Equilibrium structure, Balun broadband matching, Coupler feedback and Power backoff technology. Equilibrium structure is used to greatly improve the second order distortion and Lossless coupler feedback to reduce the noise. The RF frequency is 1...
A short-wave broadband mixer with high linearity based on double-balanced structure is presented. The mixer is realized by double-balanced passive COMS FET array and balun technology. The channel-width and the bias-voltage of the FET are adjusted to optimize the mixer's performance. The balun is implemented by radio frequency ferrite transmission line transformer that has low insertion loss over wide...
A Short-wave ultra-wideband balanced amplifier with high linearity and lower noise based on balanced structure is presented. The amplifier is realized by Equilibrium structure, Balun broadband matching, Coupler feedback and Power backoff technology. Equilibrium structure is used to greatly improve the second order distortion and Lossless coupler feedback to reduce the noise. The RF frequency is 1...
A short-wave broadband mixer with high linearity based on double-balanced structure is presented. The mixer is realized by double-balanced passive COMS FET array and balun technology. The channel-width and the bias-voltage of the FET are adjusted to optimize the mixer's performance. The balun is implemented by radio frequency ferrite transmission line transformer that has low insertion loss over wide...
A kind of WCDMA RF front-end of mobile table is designed in this paper. The main building blocks of this RF front-end are receiving circuit, transmitting circuit, duplexer and regulator. A cascade mode with three LNAs is used in the receiving circuit, and a traditional cascade mode with driver amplifier and power amplifier is used in the transmitting circuit. The final measurement results show that...
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