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This paper discusses several wireless coexistence test methods in-practice and proposed for industry standards such as ANSI C63.27 The test methods include conducted and radiated setups, and utilize a range of technologies at various levels of sophistication, including consumer electronics, laboratory grade test equipment, and anechoic test chambers. Some key parameters associated with the testing...
The characterization of power radiation and coupling has been an important research subject. The partial element equivalent circuit method (PEEC) is a powerful tool in bridging the electromagnetic modeling together with a circuit solver. Even though PEEC was a convenient tool for many quasi-static applications, in this paper, we propose a new approach for PEEC to calculate the radiated and coupled...
The generation of electrostatic charge is considered for the cases of standing up from a chair and for taking off a sweater. The charge voltages have been recorded at 27°C with relative humidity (RH) of 8%, 25% and 45% and at 38°C with 8% RH. Different footwear and flooring systems have been used to cover both ESD and non-ESD mitigating footwear and flooring combinations. The voltages caused by the...
This paper presents a study of power-supply noise and ground noise impact on the timing properties of short pulse generation circuits. The timing jitter of the measured pulses is mainly from the trigger pulse generator in the circuit consisting of conventional CMOS inverters and NAND gates. Furthermore, the response surface model combined with Latin Hypercube Sampling (LHS) is proposed to model the...
This paper is focused on the construction of a conducted-emission model for a switched-mode power supply (SMPS). First, the total voltage source is extracted by measurement. Second, the coupling path between the aggressor and the victim is characterized by both simulation and measurement. Finally, the coupled noise to the victim with respect to the extracted total voltage source can be obtained by...
Radio sensitivity sweep is a required for regulatory certification and radio research and development (R&D). For radio R&D, the accuracy and speed of the measurement can affect the quality, cost and time to the market for a product. The traditional receiver sensitivity measurement method is a lengthy process using power stepping procedure. In this paper, we propose a novel technique of using...
Vectorless power grid verification is a powerful method that evaluates the worst-case voltage noises without detailed current waveforms by using optimization techniques. It is extremely challenging when considering transient current excitations, because transient currents are difficult to model and multiple time steps should be evaluated after the discretization of the system equation. In this work,...
This paper adopts neural network modeling for USB3.1 Gen 2 high speed signal channel simulation instead of conventional response surface methodology. The paper demonstrates the co-design and optimization flow of USB3.1 silicon and channel parameters and how neural network modeling captures the complex response in a wide range with high accuracy.
As the semiconductor industry advances to ever smaller technology nodes, the power distribution network (PDN) is becoming an essential design factor to ensure system performance and reliability [1]. The time domain simulations typically utilize the chip power model (CPM), generated by Ansys RedHawk, as the current load. The typical CPM only includes current consumption in a few clock cycles, which...
A general method is proposed to extract frequency dependent RLGC model from simulated S-parameters for multi-conductor transmission line structures with periodic three-dimensional geometries. It is demonstrated to be robust for both short and long structures and various geometries, and highly efficient for structures with a large number of lines. The method has been tested for transmission line systems...
The residual stirring action of two commercially available electric field probes is experimentally and numerically analyzed. The capability to stir the reverberation chamber field is not negligible, and it alters the independent positions of mechanical rotating paddles when the spatial correlation matrix method is applied to evaluate them. The numerical code adopted for the simulations reveals its...
A differential via structure with four varying factors are defined in this paper. The Monte Carlo (MC), stochastic collocation (SC) and design of experiments (DoE) methods are employed to quantify the drilling uncertainties in the abovementioned via structure. A comparison of the results shows that the SC method is more robust and can more efficiently and accurately estimate the mean and the standard...
The polynomial chaos-based stochastic Galerkin method is implemented in a magnetized plasma finite-difference time-domain (FDTD) algorithm to characterize the uncertainty characteristics of electromagnetic wave propagation in the ionosphere. This new algorithm efficiently calculates in a single simulation not only the mean electromagnetic field values, but also their standard deviation as caused by...
It is shown that a patterned ground structure (PGS) in a printed circuit board results in a significant increase in far-field radiation, compared to the same board without the PGS. Full-3D simulations, near-field scans, and far-field measurements are used to study and quantify the increased electromagnetic interference (EMI) due to the PGS. It is concluded that the increased EMI from a board using...
With the evolution of PC client platforms and their form factors, the dominating RFI sources of the past may no longer be relevant. This paper discusses the latest trends and challenges concerning RFI issues in current or future mobile devices. High-speed differential I/O, integrated voltage regulator (IVR), and double-data-rate (DDR) memory are the emerging RFI concerns and are studied with theoretical...
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