High Speed Digital Design & Verification Seminar. Measurement fundamentals
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1 High Speed Digital Design & Verification Seminar Measurement fundamentals
2 Agenda Sources of Jitter, how to measure and why Importance of Noise Select the right probes! Capture the eye diagram
3 Why measure Jitter? Determine the probability of how often a design will meet a bit error rate specification (10-12 BER typically desired). Understand the source of jitter in order reduce jitter to meet a timing budget requirement. Test for compliance to ensure compatibility between components from multiple vendors. Ensure that digital designs have the timing margins to operate reliably 24 hours a day.. 7 days a week.. without crashing!
4 Where does jitter come from? Transmitter Receiver Lossy interconnect (ISI) Impedance mismatches (ISI) Crosstalk (PJ) Thermal Noise (RJ) DutyCycle Distortion (DCD) Power Supply Noise (RJ, PJ) On chip coupling (PJ, ISI) Termination Errors (ISI)
5 Total jitter components TJ: Total Jitter (convolution of RJ (based on BER) & DJ, and measured in peak-to-peak. RJ: Random Jitter (rms) DJ: Deterministic Jitter (peak-to-peak). PJ: Correlated & uncorrelated Periodic Jitter (caused by cross-talk and EMI) DDJ: Data Dependent Jitter DCD: Duty Cycle Distortion (caused by threshold offsets and slew rate mismatches). ISI: Inter-Symbol Interference (caused by BW limitation and reflections).
6 Jitter probability: BER J pk - pk = J determinis tic n s random =
7 How do real time scopes measure jitter? NRZ Serial Data Recovered Clock Jitter Trend Jitter Spectrum Units in Time Units in Time Jitter Histogram
8 Important settings for accurate results in eye diagram & jitter analysis Clock signal edge position are compared against reference Clock edges Data signal edge position are compared against reference Clock edges Is my serial system using an explicit clock I can probe? Yes-> Probe the clock and configure scope to use it! If receiver apply a multiplier -> scope must be configured to to the same If receiver apply a PLL on explicit Clock -> scope must do the same No? -> Derive the clock from the data using software PLL emulation Software clock recovery must be flexible to imitate Receiver Clock recovery Jitter Observed on Oscilloscope depend on Soft PLL Bandwidth Parameter Too Big PLL bandwidth transalte into lower observed Jitter Too Small PLL bandwidth translate into higher observed Jitter The good software PLL BW Value is the one from YOUR Reciever
9 What is real-time jitter analysis? Real-time jitter analysis consists of a collection of successive timing variation measurements displayed in multiple views where The timing variation measurements can be Data: Time Interval Error (TIE), sometimes called phase error Clock: Period, Cycle-to-Cycle, N-Cycle Parametric: Frequency, rise time, setup time, hold time in a synchronous system The views includes Eye Diagrams (repetitive volts vs time) Histograms (N vs time error) Trend (time error vs time) Spectrum (time error vs frequency) RJ/DJ separation (rms/p-p tabular) Bathtub curves (BER vs eye opening)
10 Real time Oscilloscope trade-offs Benefits of Real Time Oscilloscope Jitter Measurements Can measure data rates up to >28Gb/s Can measure jitter frequencies up to 1/2 the data rate Can use software for ideal clock recovery (no added jitter) Can correlate jitter to other signals (power supply, cross-talk) Can measure jitter on live signals with active probes General purpose tool, useful for other tasks / rms jitter noise floor typical Weakness of Real Time Oscilloscope Jitter Measurements Measuring low frequency jitter requires lots of Memory
11 Real time scope versus other jitter solutions Compliance Component Manufacturers 50 ohm fixtured Driven by standards work BERTs, TIAs, DCAs, Generators Debug PCB/System Engineering Live Signals Logic Analyzers Jitter Identification! RT Scopes - Active Probes Needed Verification Probing Sweatshops Live Signals Ease of use, reliability
12 Agilent EZJIT jitter measurement application Best shown live Signal on scope (NB This note disappears in slideshow mode) Trend Histogram Spectrum
13 Why is Noise important? Noise eats up margin By adding vertical noise By increasing jitter Noise is a significant concern in real-time scopes: Wideband front end High-speed digitizer
14 Why is vertical noise floor important? Let s consider theoretical signals with Zero jitter and fixed voltage noise with three different edge speeds and crossing a Threshold at 50% 1)Voltage noise translates directly to Timing uncertainty (Jitter) 2)Higher Vertical Noise Floor translates to higher Timing uncertainty 3)At constant amplitude noise floor, slower edge speed translates to higher Timing uncertainty
15 Noise sources Probe Attenuator Amplifier A/D Probe Noise Noise Quantization Noise Quantify your scope noise!: AC Vrms Measurement Histogram-standard deviation FFT
16 Auto measurement of noise: AC Vrms Best shown live on scope (NB This note disappears in slideshow mode)
17 Histogram: standard deviation ~ AC Vrms Best shown live on scope (NB This note disappears in slideshow mode)
18 FFT Best shown live on scope (NB This note disappears in slideshow mode)
19 FFT- ADC spurs Best shown live on scope (NB This note disappears in slideshow mode)
20 FFT-harmonic distortion Best shown live on scope (NB This note disappears in slideshow mode)
21 Noise minimization technology Patented, proprietary Agilent Faraday Shield packaging Means measurement accuracy for HSD
22 Why are probe loading and response Important? Probe loading affects your device under test. You want to observe as nearly as possible the operation of your circuits without the probe. You want to see as nearly as possible what is happening at the probe tip. You don t want to make assumptions or guesses.
23 Probe selection fundamentals The probe becomes part of the circuit under test and may change your circuit s operation (Z PROBE Infinity) The probe may or may not accurately reproduce the signal under test
24 Simplified probe loading model Circuit Under Test Z source L SIGNAL R PROBE C PROBE L GROUND Resistive, capacitive and inductive loading effects must be considered
25 Probe impedance versus frequency Z R f RES = 1 2 LC C L f RES f
26 Resistive loading Dominates Z At Low Frequencies Effects Bias change Amplitude reduction Offset shift R PROBE > 10 R SOURCE For Errors Less than 10%
27 Capacitive loading Dominates Z At Mid-Band Frequencies Effects Risetime Change Could cause circuit to START working Could cause circuit to STOP working Propagation Delay Increase Bandwidth Reduction Minimize probe tip capacitance to improve timing measurement accuracy
28 Combined inductive-capacitive loading Dominates Z At High Frequencies Effects Resonant LC Tank Low Input Impedance f RES = 1 2 LC Minimize the length of connection accessories (inductance = 1nH/mm)
29 Passive probes Compensated High-Resistance Passive Dividers Probe Tip Cable 9 MW Adjustable Compensation Capacitor Oscilloscope Input 1 MW 6-14 pf Features: Higher input resistance High dynamic range (>100V) Applications: General purpose probing High resistance nodes (<100kW) Benefits: Rugged vs. an active probe Low cost Small probe tip Tradeoffs: Lowest bandwidth (<500MHz) Heaviest capacitive loading
30 Passive probes 50W Terminated Resistive Dividers Probe Tip 50 W Cable Oscilloscope Input 450 W 950 W Input C <.2 pf 50 W Features: Low capacitive loading Highest bandwidth ( 6GHz) Applications: Low Z systems Transmission line systems Benefits: Timing measurement accuracy Low cost vs. active probe Tradeoffs: Heavy resistive loading
31 Active probing The performance of an active probe is dominated by the connection to the point being probed
32 The InfiniiMax I Technology 200 ff +sig -sig 25KW 25KW ZO=50W 50W RF Connector ZO=50W 50W 50W W ZO = 50W Oscilloscope 50W 200 ff ~ 5 mm ~ 10 cm (~4 in) Probe Amplifier Probe Cable
33 Response and loading
34 The secret
35 Differential or single-ended? EVERY signal is differential. Ground is a convenient fantasy. Differential probes offer: Higher CMRR, especially at high frequencies Immunity to Outside mode effects Higher impedance at high frequencies
36 Probing Methods for Differential Signals InfiniiMax Active Differential Probes 13 GHz Solder-in, Socket, Browser, SMA, ZIF Differential or Single-ended Use with Real-time Scope, DCA-J & BERT Soft Touch Probes: No PCB layout modification required No remaining stubs or sockets Use with 16800/16900 Series Logic Analyzers, E2960 Series PCI Express Tools DDR2/3 BGA Probes: Access Command & Data signals Use with Scopes & Logic Analyzers
37 Active probes Probe Amplifiers Agilent 1169A Agilent 1168A Specified Bandwidth 12 GHz 10 GHz Characterized Probe Tips Yes Yes Noise Referred to Input 2.5 mv rms 2.5 mv rms Attenuation 3.45:1 3.45:1 Differential Dynamic Range 3.3 V p-p 3.3 V p-p DC Offset Range +/- 16 V +/- 16 V Maximum Voltage +/- 30 V +/- 30 V N5380A 12 GHz Differential SMA Adapter Probe Head Agilent offers excellent bandwidth, characterized performance for various probe tips, low noise, low attenuation, good dynamic range and small size in its InfiniiMax II series probes N5381A 12 GHz Differential Solder-in Probe Head: 210 ff input capacitance, 50 kohm input resistance N5382A 12 GHz Differential Browser: 210 ff input C, 50 kohm input Resistance
38 Capturing an eye diagram The easiest way to get an overall idea of the quality of the serial signal Trigger on Clock signal (if available) as the rough first pass to build Eye Diagram Eye Diagram is the superposition in the middle of the screen of 3 bits Multiple case combined form the Eye (000,001,010,011,100,101,110,111) Best shown live on scope Preceeding bits might impact the ones you re seeing - this is called Inter Symbol Interferences (NB This note disappears in Use Clock Recovery with PLL Emulation on 8B/10B signal and memory folding to build eye slideshow mode) Building an Eye diagram the synchronous way: Explicit Clock used as Trigger 101 Sequence 011 Sequence Overlay of all combinations
39 What represents good enough? The eye-mask is the common industry approach to measure the eye opening Failures usually occur at mask corners But what is cause of failure? Best shown live on scope (NB This note disappears in slideshow mode) Violating USB FS 12Mb/s Eye Diagram Good Displayport Eye Diagram
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