Jitter frequency, the more commonly quoted figure, is its inverse. It then discusses the noise total pdf and its relationship with the pdfs of its component. Why skewmatched coaxial cables matter to signalintegrity. Jitter period is the interval between two times of maximum effect or minimum effect of a signal characteristic that varies regularly with time. The resulting waveform resembles an eye, hence the name eye diagram. The variance of the noise due to jitter as a function of received subcarrier index when bandedge subcarriers are unused.
Pdf an analysis of power supply induced jitter for a. To examine the lowfrequency jitter components, the spectrum can be zoomed and measured with cursors. Traditionally, sampling oscilloscope is the tool of choice for viewing and measuring optical signals. Written by the foremost experts on the subject, it leverages concepts and techniques from nonrelated fields such as. The graph is shown below for the fractional oversampling how to reduce the timing jitter. However, system timing margins are degraded by channel skew between clock and data signals and highfrequency loss. Jitter noise and signal integrity at high speed by mike peng li. It provides many benefits in measuring optical signals with low noisejitter and various measurement features optimized to characterize the optical signals. Preface xv acknowledgements xxi about the author xxiii chapter 1.
Highspeed links which employ source synchronous clocking architectures have the ability to track correlated jitter between clock and data channels up to high frequencies. This paper describes how these key channel effects impact the jitter performance and. New systemlevel techniques for optimizing signalpower integrity in highspeed interfacesfrom pioneering innovators at rambus, stanford, berkeley, and mit as data communication rates. Signal integrity generally is defined as any deviation from ideal waveform. Jitter, noise, and signal integrity at highspeed no part of any chapter or book may be reproduced or transmitted in. Onchip jitterspectrumanalyzer for highspeed digital. Power integrity analysis for jitter characterization. Download pdf highspeeddigitaldesign free online new.
In digital electronics, a stream of binary values is represented by a voltage or current waveform. Download the ppt file to see teacherspresenters notes i. Understanding signal integrity terms and measurements eye diagrams an eye diagram is the result of superimposing the 1s, 0s and corresponding transitions of a high speed digital signal onto a single amplitude, versus time display. Jitter, noise, and signal integrity at highspeed book. In a cycle less than 10 hz, this fluctuation is called wander, while fluctuation above 10 hz is called jitter. It is so called because, for several types of coding, the pattern looks like a series of eyes between a pair of rails. This property makes the jitter analysis of a clock signal much easier. Receiver jitter tracking characteristics in highspeed. The higher the ratio, the better the system immunity to noise.
Edn jitter, noise, and signal integrity at highspeed. A sinusoid signal of a clock signal with phase noise can be written as. Reducing the jitter noise power by oversampling in high speed ofdm system. Eye diagram and its relationship to jitter pdfs and noise pdfs.
It also discusses the joint pdfs, with both jitter and noise. Appreciable noise on the clock will manifest itself as jitter. The pdf of the sum of 2 independent random variable is. With an unbounded pattern, it typically follows a gaussian distribution. Signal integrity engineering for highspeed links christian schuster. In telecommunication, an eye pattern, also known as an eye diagram, is an oscilloscope display in which a digital signal from a receiver is repetitively sampled and applied to the vertical input, while the data rate is used to trigger the horizontal sweep. By default, the spectral plot shows the entire jitter content of the signal. Jitter, noise and eyediagram analysis solution tektronix. Altera highspeed programmable logic devices provide features to help support highspeed design. Over short distances and at low bit rates, a simple conductor can transmit. Stefan erb submitted as thesis to attain the academic degree dr. Analysis of a spread spectrum clock signal, showing the 39 khz triangular modulation on the 98 mhz clock. Reducing the jitter noise power by oversampling in high.
Jitter and noise separation and analysis in statistical domain 1. Source, mechanism, and math model for jitter and noise 75. Introduction reproduced by permission of pearson education, inc. Mathcad modelling scripts includes appendix c coded for mathcad v. The circuit transmits the clock signal to the gate driver where it clocks a. Eye diagram with timing jitter and amplitude noise pdfs. However, digital signals are fundamentally analog in nature, and all signals are subject to effects such as noise, distortion, and loss. A synergistic approach to signal integrity for highspeed digital design this book is designed to provide contemporary readers with an understanding of the emerging highspeed signal integrity issues that are creating roadblocks in digital design. Realtime oscilloscopes are preferred for ample debugtroubleshooting and to capture intermittent. High speed circuit board signal integrity download ebook. A guide to making rf measurements for signal integrity. Mike peng li, jitter, noise and signal integrity at high.
Source, mechanism, and math model for jitter and noise 75 chapter 4. Li provides powerful new tools for solving these problemsquickly, efficiently, and reliably. Declaration of originality i, linson thomas, roll number 214ec2185 hereby declare that this thesis entitled power integrity analysis for jitter characterization presents my original work. The terms noise and jitter can mistakenly be confused, even more so as data rates and signal amplitudes have changed over time. Signal integrity analysis of 28 gbits highspeed digital signal. With todays highspeed serial buses, there is often significant energy at the 5th. Statistical signal and linear theory for jitter, noise, and signal integrity 27 chapter 3.
Jitter, noise, and signal integrity at highspeed mike. Jitter, noise, ber jnb, and interrelationships 109 chapter 5. Appendix c includes all the equations from the back of the book, with examples. Noise, and signal integrity at highspeed, prentice hall, 2007. Jitter is fluctuation in the timeaxis direction of a digital signal. Statistical signal and linear theory for jitter, noise, and signal integrity 27. The predicted supply noise induced jitter is shown to correlate well with the measurement data for a high speed io interface operating at 6. A synergistic approach to signal integrity for highspeed digital design. Authors biography hai lan is a senior member of technical staff at rambus inc. Jitter noise and signal integrity at high speed by mike peng li free ebook download as pdf file.
Jitter, noise, and signal integrity at highspeed by mike. By using tools that help you rapidly characterize and discover sources of jitter and signal integrity concerns, you can bring new designs to market faster, with more confidence that they operate reliably in todays ultra highspeed environment. In jitter, noise, and signal integrity at highspeed, dr. Jitter analysis methods for the design and test of highspeed serial. Jitter, noise, and signal integrity at high speed isbn. Welldesigned systems have sufficient noise margins, called signal to noise ratio. Written by the foremost experts on the subject, it leverages concepts and techniques from nonrelated fields such as applied physics. An analysis of power supply induced jitter for a voltage mode driver in high speed serial links. Highspeed digital design overview signal integrity. This can be achieved by following some simple analog design rules and using careful pcb layout techniques. Jitter, noise, and signal integrity at highspeed isbn.
Jitter noise and signal integrity at high speed issuu. Prediction and measurement of supply noise induced jitter. Li provides powerful new tools for solving these problemsquickly. Jitter noise and signal integrity at high speed by mike. Jitter caused by external factors such as thermal noise. Consequently, the jitter on the lowspeed signal can be measured easily using conventional jitter measurement techniques and mapped back to its corresponding value relative to. Jitter, noise, and signal integrity at highspeed a tutorialpart i. Pdf jitter, noise, and signal integrity at highspeed semantic.
As a digital signal becomes attenuated and approaches noise level, the trigger point becomes unstable. Introduction to signal integrity for students and young engineers by abhijit mahajan. Cadence sigrity systemsi signal integrity solutions datasheet. However, certain signal integrity signatures such as overshoot, undershoot, and ringing see figure 1. Reproduced by permission of pearson education, inc. Figure 31 shows an ideal signal and a signal that has jitter with a. Examples include serdes for highspeed io signal transmission as well as generalized differential measurements found in highspeed interfaces such as usb 3.
Relation between rms period jitter and phase noise using the fourier series expansion, it can be shown that a squarewave clock signal has the same jitter behavior as its base harmonic sinusoid signal. Jitter, noise, and signal integrity at highspeed no part of any chapter or book may be reproduced or transmitted in any form by any means without the prior written. Jitter, noise, ber jnb, and interrelationships 109. Using a highspeed scope for digital jitter measurements the following questions and answers were created from the live eseminar broadcast of october 22, 2003. As a common transmission line, the microstrip line plays an important role in highspeed circuits. Introduction to jitter, noise, and signal integrity at. Speed noise and grounding seminar signal integrity. This book is designed to provide contemporary readers with an understanding of the emerging highspeed signal integrity issues that are creating roadblocks in digital design. Jitter analysis methods for the design and test of high. Jitter analysis methods for the design and test of highspeed serial links distribution tail fitting based on gaussian quantile normalization dipl. Jitter, noise, and signal integrity at highspeed paperback. The challenges of highspeed design require some additional effort to ensure signal integrity. Please select some articleschapters to export citations.
439 156 1467 1478 1475 954 276 99 1531 1599 426 1291 1539 62 1645 508 1466 301 586 1110 820 1145 1359 1643 63 1472 1504 1456 433 1468 120 707 427 69 738 374 45 726 162 299 237 359