Agilent Technologies N4970A User Manual Download Page 26 | Manualshive

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Agilent Technologies N4970A User Manual Download Page 26

Operation

26

PRBS Generator 10 Gb/s User Guide

Figure 7. Verification setup

Correct pattern length is determined by confirming that the tone spacing on

the spectrum analyzer equals (Output_Bit_Rate/(2

n

-1)), where n is the

specific pattern length. As an example, at 10 Gb/s the tone spacing for a

(2

31

-1) pattern should be ~ 4.66 Hz (refer to Table 4 for tone spacings).

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Summary of Contents for N4970A

Page 1: ...Agilent N4970A PRBS Generator 10 Gb s User Guide ...

Page 2: ...e written agreement with warranty terms covering the material in this document that conflict with these terms the warranty terms in the separate agreement shall control Technology Licenses The hardware and or software described in this document are furnished under a license and may be used or copied only in accordance with the terms of such license Restricted Rights Legend If software is for use i...

Page 3: ...ent Conditions This instrument is intended for indoor use in an installation category II pollution degree 2 environment per IEC 61010 Second Edition and 664 respectively It is designed to operate within a temperature range of 10 to 40 C at a maximum relative humidity of 80 for temperatures up to 31 C decreasing linearly to 50 relative humidity at 40 C at an altitude of 2000 meters This module can ...

Page 4: ...ed by electrostatic discharge ESD therefore avoid applying static discharges to the panel input connectors China RoHS regulations include requirements related to packaging and require compliance to China standard GB18455 2001 This symbol indicates compliance with the China RoHS regulations for paper fiberboard packaging Indicates the time period during which no hazardous or toxic substance element...

Page 5: ...lectronic product in domestic household waste Product category With reference to the equipment types in the WEEE Directive Annexure I this product is classed as a Monitoring and Control instrumentation product Do not dispose in domestic household waste To return unwanted products contact your local Agilent office or see www agilent com environment product for more information ...

Page 6: ......

Page 7: ... Quick Reference 15 2 6 Safety and Regulatory 18 2 6 1 Declaration of Conformity 18 3 Performance Specifications 19 3 1 General 19 3 2 N4970A PRBS Generator Specifications 20 4 Operation 21 4 1 General Information 21 4 1 1 Performance Recommendations 22 4 1 2 Connector Care 22 4 2 Configuring Patterns or Mark Density 23 4 3 Resetting the N4970A 24 4 4 Input and Output Connectors 24 4 5 System Veri...

Page 8: ...Getting Started 8 PRBS Generator 10 Gb s User Guide ...

Page 9: ...specified the protection provided by the equipment could be impaired This product must be used in a normal condition in which all means for protection are intact only Before switching on this instrument make sure the supply voltage is in the specified range This instrument has auto ranging line voltage input Be sure the supply voltage is within the specified range To prevent damage to the instrume...

Page 10: ...ocket then plug the converter module into the N4970A 1 2 Important Notes Use ESD protection at all times when using the system Review min max specifications before applying input signals Use only SMA connectors on the RF ports Use dust jackets on unused back panel connectors Situate the instrument away from heat sources 1 3 Performance Recommendations 1 When using differential mode connections ens...

Page 11: ...eye pattern The source provides five selectable pattern lengths and three selectable mark densities The N4970A comes in an easy to use compact 3 5 x 3 5 x 1 0 inch package The PRBS generator provides the clean eye needed to evaluate the performance of optical system components or complete systems e g SONET SDH 10 Gb s ethernet XAUI etc 2 1 Features Single frequency clock source Wide operating rang...

Page 12: ... optical components or systems can be performed For R D applications the N4970A source provides the engineer with a fast rise fall time low jitter data stream which is useful in the development of datacom telecom products Accurate repeatable eye pattern measurements provide a valuable development tool for evaluating and comparing the performance of design or components The small size of the N4970A...

Page 13: ...eration 300 mV p p output N4970A 010 extended amplitude range 750 mV p p output N4970A 301 internal clock frequency at 10 66423 GHz N4970A 302 internal clock frequency at 10 51875 GHz N4970A 303 internal clock frequency at 11 09573 GHz N4970A 304 internal clock frequency at 9 95328 GHz N4970A 305 internal clock frequency at 10 709225 GHz N4970A 306 internal clock frequency at 10 3125 GHz ...

Page 14: ...ovides a means to restart the bit stream from an all zero condition Output The PRBS signal is available as a differential signal on the SMA female output terminals Terminate unused outputs Impedance 50 Ω Max DC 5 V Nominal DC 0 V AC Level 300 mV p p typical single ended 750 mV p p typical single ended Option 010 ESD sensitive terminate if unused DC Blocked ...

Page 15: ...e selected pattern length The next three indicate the selected mark density as illustrated below Figure 3 N4970A front panel 2 5 Rear Panel Quick Reference Figure 4 N4970A rear panel Power Negative 5 Vdc 1 A center pin negative is supplied by the power supply module to this terminal to power the PRBS source Use only the AC DC adapter provided with the N4970A ...

Page 16: ...put A female SMA connector is provided for the internal clock output The clock is factory set and cannot be adjusted Impedance 50 Ω Max DC 5 V Nominal DC 0 V AC output 600 mV nominal ESD sensitive terminate if unused DC Blocked Clk input A female SMA connector is provided for the PRBS clock input which establishes the timing of the PRBS A rigid coax loop is supplied to connect the CKO output to th...

Page 17: ...or 10 Gb s User Guide 17 CKO 16 output A female SMA connector provides a divided by 16 clock output CKO 16 CKI div 16 for triggering Impedance 50 Ω Max DC 5 V Nominal DC 0 V AC output 600 mV p p nominal DC Blocked Figure 5 N4970A rear panel ...

Page 18: ...y or loss of life To prevent electrical shock disconnect instrument from mains before cleaning Use a dry cloth or one slightly dampened with water to clean the external case parts Do not attempt to clean internally For continued protection against fire hazard replace fuses and or circuit breakers only with same type and ratings The use of other fuses circuit breakers or materials is prohibited The...

Page 19: ... General Table 1 General and mechanical parameters of N4970A Operating Temperature 10 to 40 C Storage Temperature 40 to 70 C Power Requirements 42 W External AC Adaptor included 100 to 240 VAC 50 to 60 Hz Physical Dimensions W x H x D 3 5 x 1 0 x 3 5 inches Weight 0 22 kg 0 5 lbs EMC Complies with European EMC Directive 2004 108 EC IEC EN 61326 1 CISPR Pub 11 Group 1 class A AS NZS CISPR 11 ICES N...

Page 20: ... Option 301 10 66423 GHz Option 302 10 51875 GHz Option 303 11 09573 GHz Option 304 9 95328 GHz Option 305 10 709225 GHz Option 306 10 3125 GHz Internal clock output power 600 mV p p nominal Divided clock output Clock rate 16 Divided clock output power 600 mV p p nominal PRBS patterns 2n 1 n 7 10 15 23 31 Mark space density 1 2 1 4 1 8 Data output amplitude single ended 2 300 mV p p typical 750 mV...

Page 21: ...andling RF input outputs ground coaxial cable conductor pins before use to remove static buildup Situate the instrument away from heat sources Do not allow foreign material into enclosure Always use provided AC adaptor Do not power the unit with a different adaptor Do not modify the power plug or wall outlet to remove the third ground pin Do not drop or shake the instrument minimize vibration hand...

Page 22: ...970A features high quality SMA connectors for the front and rear panel Input and Output RF connections Connector damage will degrade signal fidelity Agilent Technologies also recommends the following Use a 7 to 10 in lbs torque wrench when attaching connectors Consider using connector savers to prolong performance and minimize damage Differential connectors may be used single ended if second end t...

Page 23: ...eads 5 Allow alcohol to evaporate and then use a low pressure air source to blow surfaces clean 6 Make sure no particles or residue remains 7 Inspect connector for damage 4 2 Configuring Patterns or Mark Density To configure the N4970A for the desired patterns P or mark space densities D apply the appropriate jumper to the configuration connector on the back of the N4970A In the example below we a...

Page 24: ... Level DC Level Z0 Notes Data Data positive output 0 V 300 mV p p typical 750 mV p p typical Option 010 50 Ω DC blocked ESD sensitive SMA connector Data Data negative output 0 V 300 mV p p typical 750 mV p p typical Option 010 50 Ω DC blocked ESD sensitive SMA connector CKO 10G clock output 0 V 600 mV p p nominal 50 Ω DC blocked SMA connector CKI External clock input 5 V to 5 V max 2 V p p 10 dBm ...

Page 25: ... center contacts while they are engaging This wears the plating thereby decreasing the signal integrity and operating life of the connectors Hold the body of the connector while using a torque wrench to loosen the coupling nut 4 5 System Verification Figure 7 shows a configuration used to verify the performance of the PRBS source with an external clock The N4970A internal clock can also be used wi...

Page 26: ...orrect pattern length is determined by confirming that the tone spacing on the spectrum analyzer equals Output_Bit_Rate 2n 1 where n is the specific pattern length As an example at 10 Gb s the tone spacing for a 231 1 pattern should be 4 66 Hz refer to Table 4 for tone spacings ...

Page 27: ...ng different mark densities is to observe the relative screen intensity for the two logic states For MD 1 2 the resulting eye will appear equally bright for logic 1 s and 0 s while an MD 1 8 will yield a much brighter logic 0 vs logic 1 Waveform characteristics such as jitter amplitude rise and fall times are read directly from the sampling oscilloscope s measurements Nominal measurements are all ...

Page 28: ...system is shown in Figure 8 Additive jitter measurements require a precise low jitter clock A high quality external clock may decrease PRBS jitter Figure 8 N4970A generic test example experimental setup To maintain the integrity of the system the user must select the appropriate connectors and minimize the length of microwave cabling ...

Page 29: ...A fails system verification and you cannot correct the problem return it to Agilent Technologies for repair following the steps shown below 1 Record all symptoms 2 Contact Agilent Technologies at http www agilent com find assist 3 Use the original packing material or comparable packing material to ship the instrument to Agilent Technologies ...

Page 30: ... Copyright Agilent Technologies 2012 Second edition May 2013 Printed in Germany ...

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