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A method to estimate the frequency spectrum of IC power supply by measuring transient voltage on Power Distribution Network (PDN) was proposed in this work. The proposed method was validated through measurement on a testing board with three clock driver ICs. The result show good agreement between the estimated current spectrum and measured current spectrum at the major spikes.
Depending on the PCB fiber weave style, electrically long differential microstrip signal traces may introduce significant signal skew due to weave effect that deteriorates the signal quality. As closed-form expression for the effective permittivity that includes the weave effect is not readily available, full-wave method is often used to study the weave effect. As such, a novel analytical method is...
A method on developing pre-layout PDN model utilizing 3D full-wave simulation was proposed in this work. The proposed method divides the PDN into different blocks and obtains the network parameters of each block using 3D full-wave simulation. The proposed method was validated with post-layout simulation. Results show that PDN impedance obtained from pre-layout PDN model developed using proposed method...
Electrically long differential signal traces may introduce significant signal skew due to weave effect that deteriorates the signal quality. As serial data link pushes towards higher data transfer rate and yet the length of the signal trace has not reduced, the weave effect will become significant. Full wave method is often used to study the weave effect, however, the computational time is expensive...
Based on measurements from a near-field scanner and far-field measurements obtained in a semi-anechoic chamber, a statistical relationship is established between a magnetic field in the near field and an electric field in the far field. The relationship makes it possible to transform a radiated-emission regulatory limit from the far-field to the near-field zone. The transformed near-field limit can...
This paper discusses a novel approach to transforming a radiated-emission limit (e.g., CISPR 22 and FCC) from the far-field to the near-field region. The proposed approach combines data from a near-field scanner and a gigahertz transverse electromagnetic cell with statistics to establish a simple relationship between a near-field magnetic field and a far-field electric field. It is shown that the...
In this paper we introduce a novel technique based on the random excitation of several antennas. As opposed to previous attempts at this approach, the random signals are correlated by means of a pre-conditioning filter, in order to increase the number of accessible degrees of freedom and optimize the covariance matrix of the field measured in the chamber. A dramatic improvement is observed at those...
With proper frequency management, one can prevent in-band radio frequency interference (RFI). However, at out-of-band (OOB) frequencies, RFI is almost impossible to prevent. And such OOB interference characteristics of communication devices may not be provided by the supplier of the devices. In this paper, we present the results of OOB conducted susceptibility measurement for a VHF/FM communication...
In this paper, the out-of-band characteristics of the airborne blade antennas are studied in terms of their gain and radiation properties. A prediction model was derived for both the lower out-of-band and upper out-of-band frequencies of a typical blade antenna.
In this research work, blade antennae operating in the L band and S band are studied to understand the electromagnetic compatibility and susceptibility of the blade antennae. Both the in-band and out-of-band performance of the antennae with varying structural parameters are analyzed based on the simulation and far-field measurement results. A generic equation has been derived to predict the in-band...
This paper describes a methodology to predict far-field (FF) emissions from a high-speed board based on the fields measured in the near-field (NF) region. The NF to FF transformation is based upon an empirical relationship between the measured fields in both the NF and FF regions. Initial results show that the predicted FF emissions from a high-speed board provide the designer a good confidence on...
In today's high-speed board design, decoupling using on-board capacitors are necessary to provide stable DC power and to suppress radiated emission from the board. At the higher frequency beyond 300 MHz, one has to rely on the capacitance offered by the power-ground plane pair in multi-layer stackup to provide effective decoupling. This paper provides an in-depth analysis on the suppression of board...
This paper presents a simplified parameter extraction method for modeling on-chip spiral inductors. Our method bypasses time-consuming numerical optimization and is simpler than previous parameter extraction procedure. The parameters of the spiral inductor model can be extracted simply and directly without involving complicated formulas. It is also found that the extracted parameters are more accurate...
In this paper, the shielding effectiveness of a composite component bay is simulated using both frequency domain and time domain methods. Five monitoring points are equally separated inside the component bay. Results gathered from measurements are compared to simulation results. The incident field is excited from different azimuth and elevation angles around the component bay in both simulations and...
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