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A systematic analysis methodology for mobile phone's electrostatic discharge (ESD) soft failures is proposed. The proposed analysis methodology consists of two parallel processes: one is the ESD simulation and the other is the ESD characterization of the mobile phone. The ESD simulation models that consist of the ESD generator, the ESD testing setup, and a mobile phone are also developed and their...
A systematic design technique for the improvements of the mobile phone's immunity to the electrostatic discharge (ESD) soft failures is proposed. The design technique consists of two parallel processes; one is the ESD simulation and the other is the ESD characterization. The modeling methods of the mobile phone, the ESD gun and the ESD testing setup for the ESD simulations are also developed. The...
A technique for the analysis of mobile phone's immunity to the electrostatic discharge (ESD) soft failures is proposed. First, a mobile phone, ESD simulator and ESD testing setup are modelled and then the simulation is performed using time-domain full-wave electromagnetic simulator. The proposed technique is applied to the analysis of ESD soft failure of mobile phones and the root causes of the ESD...
This paper introduces an efficient method to calculate the total isotropic sensitivity (TIS) of a mobile phone. The method is implemented by using the EM simulation, the digital signal modeling and the RF link budget simulation. By considering digital harmonic noise, the accuracy of the TIS calculation can be increased. Simulation results for the phone structure show the availability of this proposed...
This paper presents the technique to improve radiation performance of folder type mobile phone by using the hinge contact structure with the capacitive gap. Variation of the efficiency due to the change of capacitive gap distance is analyzed and the optimized distance is derived. The efficiency obtained from simulation results is compared with that from measurement to verify the proposed method.
Various different types of PCB pattern modeling methods for new RF co-simulation technique are presented and applied to wireless phone application. PCB electromagnetic (EM) modeling is essential part of new RF combinational simulation - RF components plus PCB 3D pattern concurrently modeled, however, it takes typically few-hours burdensome modeling time. In this paper, several intermediate forms of...
Digital harmonics could be coupled to a RF system in a digital & RF mixed signal board or a package. The coupled digital harmonic could reduce the RF sensitivity of the system, or cause a system failure. Digital to RF coupling is the most important factor of degrading mixed-signal systems. The analysis methodology of evaluating the RF performance reflected by the digital harmonics is addressed...
The mutual coupling between two internal antennas using same communication band in simplified dual-standby simulation model has been researched. Furthermore, the excited current distributions on the PCB and the electric field distributions in the near field have been investigated as the cause of coupling. In terms of antenna type, PIFA type antenna was better than monopole type in the isolation viewpoint...
A novel technique of suppressing coupling between two main antennas is presented. By inserting complementary radiation structure that is shorted (shorted radiation structure: srs), coupling between antennas in the commercial handset is dramatically decreased without the variation of return losses and efficiency.
A RF co-simulation platform consisting PCB electromagnetic (EM) modeling and behavioral modeling has been proposed for the wireless handset application. Through integration of EM PCB pattern models, RF component models and RF transceiver behavioral models, complete RF co-simulation could be accomplished. Established simulation platform has been applied to 1800 MHz CDMA mobile phone (Korean PCS) and...
A RF co-simulation platform consisting PCB electromagnetic (EM) modeling and behavioral modeling has been proposed for the wireless handset application. Through integration of EM PCB pattern models, RF component models and RF transceiver behavioral models, complete RF co-simulation could be accomplished. Established simulation platform has been applied to 1800 MHz CDMA mobile phone (Korean PCS) and...
This paper presents an accurate modeling technique to estimate radiation performance of commercial bar type mobile phone by using the mechanical-CAD data. In particular, important parts of radiation performance such as a LCD module, a PCB, antenna feed area, a FPCB and an EMI sheet are finely considered to model. Simulation results of the radiation efficiency and specific absorption rate (SAR) are...
A novel scheme for rejecting a nonlinear distortion is derived with an emphasis on self-homodyne architecture for OFDM systems over multipath fading channels. To cancel out the nonlinear distortion arisen at the square-law detection output of a receiver, data symbols are generated and consecutively transmitted over a channel, with same amplitude but out of phase one another. These two received signals...
The time-domain baseband equivalent model for a mobile WiMax, IEEE 802.16e RF transceiver has been addressed in this paper. The baseband equivalent model is built up based on complex signals and spectrum. Nonlinearity up to the fifth order harmonics is considered, and noise characteristics are modeled in time domain for amplifiers and mixers. The time-domain phase noise is also implemented as part...
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