Validating_Differential_PCB_im操作说明书手册pedacne_with_GigaProbes

Validating Controlled ImpedanceDifferential PCB Manufacturing Processby DVT Solutions,LLC www.gigaprobestek.comTDR Testing ObjectiveResearch In Motion (RIM came to DVT Solutions,LLC to validate a few 100 ohm controlled differentialimpedance pairs 4mm apart on the PCB that goes into their Blackberry mobile phones as a second testing sourceto verify the data provided from their PCB manufacture correlates and is acceptable.RIM recognizes validatinghigh speed differential traces on their PCB's are balanced 100 ohm interconnects because it confirms the layouttools and the manufacturing processes are performing correctly.When the components are installed on the PCBthe circuitry will operate properly and not delay product introduction or lead to the return of 1000's of nonfunctioning phones,saving RIM substantial amount ofmoney.To validate critical differential controlled 100 ohm impedance traces are made easy using the GigaProbes,atrue odd mode balanced 100 ohm 30Ghz differential TDR probe,a Tektronix DSA8200 with a 80E04 differentialTDR sampling modules.Using faster TDR modules provide added impedance resolution to support testing highspeed designs or for Failure Analysis applications.The accessories that come with the GigaProbes DVT30-1MM-1 include adapters for attaching the probe to a manipulator for hands free probing to free the operator to controlthe TDR instrument.Two 24Ghz SMA Cables are included to connect the probes to the TDR modules and more.In this test case,we measure two differential 100 ohm test points and describe it physical layout and determine ifthe max/min impedance is within +/-10percent or it is determined this PCB is out of specification the circuitdesign would not operate correctly.We also show by changing the TDR rise time it has an effect on theimpedance measurements.We also list of all equipment used to make these measurements in case you want toreproduce these tests.TDR InstrumentDifferential TDR ProbesGiga Probestegrity Resource LibraryGiga ProbesThe DSA 8200/8E04 20GHz TDR sampling system with theConnect the DVT30-1MM GigaProbes to the DSA 8200uses IConnect Signal Integrity Software created accurateTektronix TDR system for Differential and Single Ended 30 GHzImpedance measurements for PCBanalysis.for validating PCB design and manufacturing specifications onhttp://www.tek.com/applications/serial data/interconnect.htmlcritical interconnect test paths.www.gigaprobestek.com