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IRIS is a consolidated platform to analyse bulk S-Parameter data, perform operations like termination/renormalization of port impedances, conversion from single-ended to mixed mode, evaluate complex equations in S-Parameters, plug-in, View and record Violation of envelopes as defined by SATA, SAS, PCIe & USB spec sheets. It also implements a novel machine-learning based methodology [1] to efficiently...
An electrical study on USB2.0 channels supporting multiplexers, BC1.2 power switches and charging modules is presented in this paper. The issues caused by the inclusion of the aforementioned devices in a USB2.0 channel are tackled in the key learnings of this paper. The proposed methods focus on channel design on existing and new signaling. Of note, they maintain design flexibility, while maintaining...
The large multiscale problems are commonly faced in real-world applications such as analysis of electromagnetic interference for a printed circuit board installed on a large platform with connected cables and wires. Unfortunately, modeling the multiscale structures is the bottleneck of electromagnetic numerical solvers. This stems from the fact that to capture objects with different scales, disparate...
In this work, low and high temperature environmental tests were conducted on a switching mode RF CMOS power amplifier according to the MIL-STD-810G standard. The efficiency of the power amplifier was increased by 5% at −32 °C while it was decreased by 4% at 63 °C. In order to determine the influence of interconnects on the performance, the effect of temperature on single bond wires of different lengths...
This paper presents a fast prediction method to evaluate the near-field shielding effectiveness(SE) for conformal-shielded System-in-Packages (SiP). By revising the typical EM method to meet SiP circumstances, the near-fieldSE can be quickly estimated. A simple conformal-shielded SiP module is designed. To experimentally verify the proposed method, two kinds of metallic shielding materials, copper...
This paper presents techniques to accelerate the exploration of advanced memory links through IBIS-AMI modelling of the transmitter and receiver. The rerults show over 1000x CPU time speed improvement compared to full transistor level SPICE simulations while providing a fair representation of the interface performance. To demonstrate the versatility the IBIS-AMI for memory interfaces, data transmission...
Transmission lines carrying high speed I/O signals can couple significant amount of electromagnetic energy to power distribution network (PDN) which can then adversely affect signal and power integrity of the entire electrical system. Similarly the reverse is also true. In this paper we present three printed circuit board designs with different power distribution topologies and show through measurement...
This paper describes an explicit leapfrog scheme that is stabilized for an arbitrary time step size in the fast transient simulation of a power delivery network (PDN). A time step size used in a basic explicit leapfrog scheme becomes too small if there exist extremely-small reactances in a circuit. Because such small reactances are usually extracted from small meshes, the basic leapfrog scheme is...
The Foldy-Lax formulation for the electromagnetic modeling of planar, multilayered substrates with multiple pins and vias is extended to include the presence of back-drilled via holes. A validation study of the accuracy of the proposed model is also presented.
The paper presents an efficient and accurate methodology for evaluating near singular Green's function integrals for 3D boundary element-based full-wave analysis of interconnect structures in IC packages and printed circuit boards using quadrilateral basis function.
This paper describes a new approach to the statistical characterization of high-speed interconnect circuits. The proposed approach is based on the idea of polynomial chaos and works by decoupling the matrices that arise from the Galerkin projection. The new approach is general in the sense that it can handle any polynomial system used in the generalized polynomial chaos(gPC) framework.
A developed method for the macromodels synthesis in the form of an equivalent circuit consisting of RLC elements, using the active covariance matrix adaptation evolution strategy (active CMA-ES), is described. A fitness function taking into account the module and phase of the frequency dependence of reflection or transmission coefficient is described. Two examples of models synthesis for resistor...
In the field of High Speed SerDes (HSS) channel analysis and design, the most widely accepted metrics for gauging signal integrity are Time Domain (TD) metrics: Bit Error Rate (BER), Eye-Height (EH) and Eye-Width (EW). With increasing bit-rates, TD simulations are getting compute-time intensive especially as the BER criterion is getting lower. Learning based mapping of Frequency Domain (FD) S-Parameter...
In this paper an algorithm is described for obtaining the response of Power Distribution Networks (PDN) arising in chip, package or pcb during an early design phase. Results are provided for power grids arising in silicon interposers to validate the approach.
Optimal power delivery network design relies on decoupling capacitors that consume significant package and board real estate, which is becoming scarce due to shrinking chip sizes and overall system form factors. This paper addresses noise reduction via capacitor interconnection between different voltage domains to leverage decoupling capacitors across domains. Novel structures that integrate decoupling...
Based on the recognition that propagating near-end crosstalk is the primary source of crosstalk noise in short unterminated channels we describe and demonstrate an approach to improve the signal integrity on such channels significantly. The basic physics and Norton formulation of crosstalk reduction by matrix matching are described. We then show large potential gains for two on-package interconnect...
This paper presents a small quad-channel driver module for optical modulators in digital coherent systems. To decrease the size of the module, we designed a compact quad-channel package. The size of the package is 14 × 8 × 2.8 mm3. The bandwidth of the driver module is 36 GHz with maximum differential gain of 15 dB. Waveforms with clear eye-openings at symbol rates of 32 and 50 Gbaud were observed...
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