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This paper reports on a signal-propagation loss through two human bodies in wearable-to-wearable intra-body communication. We investigated the signal propagation through two human bodies for expanding the two-person intra-body communication services. We estimated a detected signal power through human bodies was obtained by an experiment and simulation. The detected signal power through two human bodies...
A wireless power transfer system operated at 6.78MHz for AirFuel specification is demonstrated in this paper. The system includes transceiver, receiver, magnetic resonance coil, and data communication. To monitor the transferred power, a communication path is establish by using the micro-controller, amplitude modulator/demodulator, and voltage/current sensing circuits. All of the modules are integrated...
This paper presents the first simultaneous 8-transmit and 8-receive paths 75–85 GHz phased array RFIC for FMCW automotive radars. The receive path has two separate I/Q mixers each connected to 4-element phased arrays for RF and digital beamforming. The chip also contains a build-in-self-test system (BIST) for the transmit and receive paths. Measurements on a flip-chip prototype show a gain >24...
To enable a wide use of wireless power applications, the wireless power consortium has developed an industry standard to achieve interoperability between products that will carry the Qi logo. This paper introduces the Qi wireless power standard, explains the basic decisions that has been made in the process and provides a preview and short explanation of the system.
In this paper, the principle of wireless power transmission technology based on resonant coupling is discussed. A simplified equivalent circuit modeling for wireless power transmission system is established. A resonator constituted by single-layer helical coils is designed and investigated. Based on experiments, the output load voltage correlated with different distance, driving frequency and disalignment...
We propose a secure optical communication system based on the principles of generalized and complete synchronization of chaotic oscillations. Both a transmitter and a receiver are composed by two chaotic external-cavity semiconductor lasers which are coupled in a master-slave configuration to provide generalized synchronization, while the master lasers in the transmitter and in the receiver are completely...
We introduced here a compact 500 GHz SIS (superconductor-insulator-superconductor) heterodyne receiver system developed for POST (portable submillimeter telescope). The system is proved to have a small volume to be integrated with the small Dewar, which is cooled by a compact close-cycled 100 mW@ 4 K cryo-cooler. Test results shows that a good LO coupling and low signal loss is achieved with a less...
A high-sensitivity capacitive-coupling interface is presented for wireless wafer testing systems. The transmitter is a buffer that drives the transmitter pad, and the receiver converts the data with various logic thresholds to that with optimum logic threshold. The receiver with the optimum logic threshold achieves the highest sensitivity of 25 mV at the data rate of 2 Gb/s in 0. 18 mum CMOS. The...
Migrating solutions to the most advance CMOS process node addresses cost reduction but increases RF interference within a SoC. In this paper we address the issue of design verification of single-chip RF SOCs in the presence of unintentional cross-couplings and leakages due to proximity of aggressors and victims. We will extend a previously presented VHDL based simulation methodology that accepts RF...
An offset cancellation CMOS variable gain amplifier (VGA) is presented in this paper. Four input terminals full differential operational transconductance amplifier is used for the proposed VGA. The input signal offset is suppressed by the AC coupling circuitry. Two-stage VGA is proposed for GPS receiver. The proposed design is fabricated in 0.18 ??m CMOS process. The gain range of VGA is from 6 dB...
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