Jeong-Seok Jang

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In this paper, performance improvement of MMIC Power Amplifier using InGaP/GaAs HBT process is studied. To meet 3.9G and 4G mobile communications service demand, a power amplifier with improved efficiency and linearity that utilizes the Doherty structure and gain-expansion drive-amplifier is designed and implemented. In the measurement results, proposed(More)
In this paper, and a failure-safe system capable of operating in safety side even upon occurrence of failures was designed where IoT-based sensor nodes allowed fault tolerance based on hardware redundancy. The fault tolerance system masked faults with the application of TMR system and enabled fail-safe control by using a comparator (Exclusive-OR) for fault(More)
By using radio propagation predictions of Rec. ITU-R P.1546 combined with geographic information, formulations for field calculation and interference analysis are presented in the VHF and UHF bands. To illustrate some computational results for given system parameters, virtual geographic information data are taken into account.
With the help of Rec. ITU-R P.1546 and geography information system, the interference analysis for the fixed wireless system and radar is presented based upon the frequencydistance rules with minimum coupling loss. To obtain the computational results, real geography information on the map was taken for the given area of 80x60[km] 2 , and field strength and(More)
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