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Takahashi M.,Granite River Labs | Resso M.,Keysight Technologies
DesignCon 2015

Complex channel topologies transmitting Gigabit data streams challenge the best digital design engineers today. Advanced error correction techniques alone are not a cure all for what ails the signal integrity of our telecommunication systems. Multiple technical disciplines and various domain analysis tools are now required to provide proper insight into performance. This paper will discuss step-by-step channel analysis methodologies using microprobing measurements with simulation and modeling tools to show accurate results to 20GHz. A typical design case study using new international proprietary memory architecture will be discussed. Source

Fei Y.C.,Keysight Technologies
2014 2nd International Conference on Electronic Design, ICED 2014

This paper studies the impact of impedance discontinuity or mismatch contributed by surface mount (SMT) pads of AC coupling capacitor on Printed Circuit Board (PCB) traces with 26 Giga-bit per second (Gbps) transmission and the technique to minimize its adverse effect, which in turn mitigates the degradation of signal integrity. The design is optimized by the insertion of a cut-out on the reference plane area beneath the SMT pads. The impact of the optimization is studied for 0603 and 0402 package in 3D model extraction using EMPro software from Keysight, and simulations of s-parameter (i.e. insertion loss), time domain reflectometry (TDR) and eye diagram analysis are conducted using Advance Design System (ADS). Subsequently, the characterization using vector network analyzer (VNA) and bit error rate tester (BERT) is conducted on a prototype PCB to verify the correlation between the measurement and simulation. © 2014 IEEE. Source

Fei Y.C.,Keysight Technologies
2014 2nd International Conference on Electronic Design, ICED 2014

This paper studies the methodology of power integrity (PI) analysis for high speed printed circuit board (PCB) design. This involves the analysis of AC and DC characteristic of the PCB, and also the loop stability of the switch mode voltage source. Besides this, the best practices of designing a power rail with excellent fidelity are discussed in detail in this paper. The basic theory of operation of the switch mode voltage source and the concept of loop stability are also discussed. The results of simulated PI DC and AC analysis of PCB using Hyperlynx from Mentor Graphic, simulated and measured loop stability and transient response of switch mode voltage source are presented in this paper. © 2014 IEEE. Source

Yee C.F.,Keysight Technologies | Jambek A.B.,University Malaysia Perlis | Al-Hadi A.A.,University Malaysia Perlis
Journal of Electronic Materials

This paper provides a brief introduction to high-density interconnect (HDI) technology and its implementation on printed circuit boards (PCBs). The advantages and challenges of implementing 10-Gbps signal transmission on high-density interconnect boards are discussed in detail. The advantages (e.g., smaller via dimension and via stub removal) and challenges (e.g., crosstalk due to smaller interpair separation) of HDI are studied by analyzing the S-parameter, time-domain reflectometry (TDR), and transmission-line eye diagrams obtained by three-dimensional electromagnetic modeling (3DEM) and two-dimensional electromagnetic modeling (2DEM) using Mentor Graphics HyperLynx and Keysight Advanced Design System (ADS) electronic computer-aided design (ECAD) software. HDI outperforms conventional PCB technology in terms of signal integrity, but proper routing topology should be applied to overcome the challenge posed by crosstalk due to the tight spacing between traces. © 2016 The Minerals, Metals & Materials Society Source

Harada K.,Keysight Technologies
IEEE Transactions on Signal Processing

A novel nonparametric spectral estimation technique for phase noise based on the complementary autocorrelation (CAC) is presented. Utilizing the fact that the CAC of phase noise is not zero, this technique offers a distinct advantage that the power spectrum of phase noise is estimated whereas that of other kinds of noise are suppressed as long as they are proper (second-order circularity). This property is most useful when estimating the phase noise spectrum directly from digitally-modulated signals because those signals are typically accompanied by various kinds of undesired noise that easily mask the phase noise of interest. A frequency-domain estimation method based on complementary spectrum is presented for practical computation of phase noise spectrum. For the method, a formula for the noise suppression factor is derived assuming the properness in noise. Furthermore, suppressibility analyses are conducted, which reveal that many of the noises associated with modulated signals are indeed proper, and can thus be suppressed. Numerical simulations demonstrate the method, and verify the noise suppression factor. It is believed that this technique is the first of its kind being able to extract phase noise spectrum while suppressing many other kinds of noise. © 2014 IEEE. Source

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